...

I think my most underrated idea is Memory Acorns
http://www.halfbakery.com/idea/Memory_20Acorns

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This is a copy of something I posted once which was deleted.
Because I liked the comments so much (particularly the last few) I rescued it from the google cache.

Parity of eyes and legs

An eye for a leg, and a leg for an eye. (+4, -4)

People have 2 eyes and 2 legs.
Spiders have 8 eyes and 8 legs.

Pirates have 1 eye and 1 leg.

coincidence?

--- Loris, Apr 07 2003

//Pirates have 1 eye and 1 leg.// Between them?

--- my face your, Apr 07 2003

[marked-for-deletion] a simple observation does not an invention make. Sorry.

It is funny to consider, though.

--- bristolz, Apr 07 2003

A pirate can never be more than one step ahead of you.

--- reensure, Apr 07 2003

Potatoes aren't legumes but they have eyes.

--- Trodden, Apr 07 2003

Arrrr...

--- Mr Burns, Apr 07 2003

What is this all about? I have two eyes and fours legs (and eight lives) or do I not count?

--- The Kat, Apr 07 2003

Kat: Watch out or Loris might 'adjust' you to fit his mad scheme.

--- supercat, Apr 07 2003

And what of the humble millipede? Eye, there's the rub.

And when pirate eye be smilin'; hide your pieces of eight.

--- lostdog, Apr 07 2003

Insects: 6 legs; 2 compound eyes, 2 antennae; 4 wings (or 2 wings + 2 balancers developed from wings)(or 2 wings + 2 wing-cases developed from wings) (and no, caterpillars have 6 'true' legs and many pairs of claspers that aren't actual legs). Fish: 2 eyes and a big bunch'o'fins all over the place.

--- Rods Tiger, Apr 07 2003

On a kind of unrelated but still leg-based tangent - in her later years, my granny had both her legs amputated below the knee. She was (obviously) confined to a wheelchair, and didn't get out much. So my Dad had to do her shoe shopping for her. Being the practical-minded no-nonsense guy that he is, he'd just go into a shoe shop with her spare false legs in a plastic bag, dump them on the counter and say "I'd like a pair of nice shoes to fit these, please."

--- lostdog, Apr 07 2003

And don't forget to dot your eyes and cross your legs.

--- FarmerJohn, Apr 07 2003

Starfish have one eye and, uh, several (or zero, if you call them arms) legs.

--- galukalock, Apr 08 2003

Wow lostdog - thanks for the anecdote.

--- thumbwax, Apr 08 2003

Does this mean I have to shut one eye if I want to be a pirate?

--- oneoffdave, Apr 08 2003

It is usual to turn a blind eye to piracy.

--- Rods Tiger, Apr 08 2003

Just change your handle to [twoeyedave]. No-one will ever know.

--- egbert, Apr 08 2003

[Jun 23 2002, last modified Oct 30 2009]

3D spaghetti printer (+3, -1)
419 delete (+1, -2)
9 more digits of information (+4, -6)
a FAKE Lightsabre (-9)
Advent Calendarrr! (+3)
Ant-farm style '2D' house (+7, -1)
Anti-settling (-2)
Anti wall-hacking (+4, -7)
antipenicillinase (-2)
Auto spinner (+3)
Automatic Moth Defenestrator (+46, -3)
Baby section for trains (+7, -4)
Baked! (+13, -1)
Baroque keyboard (+11, -4)
Birdmill (+2, -2)
BitCoin for Scotland (+4, -1)
Broken link auto-fixer (+7)
Bungalow penthouse (-4)
Car identification ringtone (+2)
Certified random data (+5, -2)
Chainsaw shaver (+3, -4)
Chin tripod (+7)
Coffee chromatography (+3)
Colour cube bathroom (+4)
combination drying and heating eco-extension (+2)
Combination Vape and Train Whistle (+7, -1)
combinatorial blow-moulding (+7)
common sanity test (+3)
Constant light pipe (+4, -1)
Continentetris (+7)
Cow co-firing (+5)
crew crew crew (+2, -2)
Cross-ply corrugated cardboard (+3)
Crossword steganography (+1, -1)
Crowdsourced accentuation (+6)
crowdsourced evaluation through restricted favourites (+1)
Cursed graveyard (+2, -3)
Damn Well Shutdown (+5, -1)
Deathwang (+2, -2)
Decrypt anything ... to anything (+16, -7)
Diagonal printing (+10)
Disaster Mortality Scale (+10, -1)
Disclaiming email address (+1, -3)
Distributed rendering (+3, -1)
Do you realise you just phoned someone in-call alert (+5, -2)
Double glazed lightbulb (+1, -2)
Dualwave II (+2, -3)
Efficient electricity with free warming of water (+7)
Energy saving shower (+9, -1)
English spelling reboot (+2, -2)
Equal opportunities colour spec. (+11)
Exhibitionist censoring windows (+3)
Fabergé chocolate egg (+6, -1)
Fabergé conkers (+17, -1)
'Fast Breeder' Printer (+6, -1)
Fill your own tube (+8)
filler5 (+1)
Forum thread mutex (+3)
foul cigarettes (+2, -1)
Frag the election (+5)
Freezulation (+3, -2)
Front-loaded plot (+11, -2)
Full length alliteration (+4, -1)
Full visual spectrum Monitor (+6, -2)
Full year advent calendar (+7, -1)
GM Vaccinating Mosquitos (+9, -2)
Gold-leaf covered, coin-shaped chewing gum. (+7, -1)
Groundhog daze (+5)
Hair sharpener (0)
Heterodyne working weeks (+3)
Hidentity - hidden identity (+8)
High quality scientific journal (+3)
High speed kettle (+12)
Hinting for icons (+6, -1)
Holistic water heating system (-1)
Homopolymers begone (+7)
horse chestnut nut veneer (+12)
Hydrogen powered Shower (+11)
Hyperpredictive text (+10)
Infinite energy from Vampires (+24, -7)
Infinite leading Ks (-4)
intelligible One time Pads (+3, -2)
intelligible volume control (+1)
Interpret rapper posturing as sign language (+8)
Introspective memorial block (+8)
inverse google (+10, -1)
jumping rollercoaster (+1, -2)
kettle with telemetry (+4)
Land of milk (+1)
Law to evicerate undesirable laws (+1, -1)
layers of unconformity (+4)
LCD defect ameliorating device (+8, -2)
Leakproof exam papers (+2)
Legible licence plates (+1, -1)
Less identity theft through receipt re-use (+1, -2)
Lifetime Term Limit for Home Secretary (+2)
Ligase sequencing (+5)
Limestone pillar supports (+7)
Linked City (+7, -1)
Loadbearing glass bricks (+12, -1)
Lock cutting service (+6, -2)
Logarithmic Dice (+2)
Low density hetrogenous tank armour (+4, -3)
Low-temperature chocolate (+7, -1)
MacDuff's Horoscope (+2, -1)
Marianne's Moor romantic services (+13, -1)
Maximal difficulty jigsaw (+6, -1)
Memorial hues (+5, -5)
Memory Acorns (+3, -3)
Micro-reservoir (+2, -4)
Milk pills (+12, -1)
misadventure photogenic service (-1)
Mixed football (+3, -1)
Money Laundering machine (+1)
Monolithic glasses (+4)
more interesting stall occupancy indicator (+6)
More recursive shampoo (+2, -3)
Move Christmas into Feburary (+5, -3)
Music Church (0)
musical fidget spinner (+5)
Naming a game (+3)
No mantissa floating numbers (-2)
No more Huntington's disease (+3)
onscreen keyboard highlighter (0)
Optical Communicator (+3)
Optimum Idea Placement (+2, -2)
Partition the UK (+1, -1)
Password fragment check (+1)
Patterned toothpaste (+7, -1)
Physalis tea-bags (+2)
Pinball Exercise Machine (+2)
Piracy prevention method (-5)
Portable Safe (+1)
Pre-censored T-shirts (+9, -2)
Precision broken clock (+2)
Processing Mist (+1, -1)
Psychic CAPTCHA (+4, -1)
'Pure' Ice Lollys (+4)
quantum sunglasses (+6)
Random bible quote christmas cards (+14)
Random block vote option for Yes/No referenda (+2)
Random number salvage (0)
Randomised monkey vote (+3, -4)
Rating normalisation system (+2)
Recursive Cheer-leading (+21, -4)
Redesign The Zeppelin ... as a giant rugby-ball (+6, -1)
Relayering (+7)
Rename amino acids (+8, -1)
Reproach minimising gun (+4, -9)
Reverse Steganography (+3, -3)
Ridiculously huge cryptographic keypad (+4)
Ringing the convoy (+5)
Rock printer (+4, -1)
Rot19 (+6)
Roundabout Tower (+6, -1)
Rude passwords (+5)
Sacrificial tree-root damage mitigation pots (+2)
Safer Pelican Crossing (+5)
Salt of the Earth (+7, -3)
sandwich wrap catheter (+10)
Scientifically based dating service (+2, -1)
Scythe gun (0)
Sea glass manufacturing beach (+14)
self-propelled pulse-jet brass band (+9)
Sentiment of-some-sort card (+1, -4)
simple keylogger defence method (+5, -1)
Skelaghetti (+7)
Snail shell backpack (+6)
Snow harvesting infrastructure (+7)
soft, billowing hair headband (+3)
Sorting hat for MPs (+3)
Spam surprise (-1)
Splitscreen multi-use widescreen TV (0)
spoiler tarpit (+6)
Spring backbackback, backbackback (+4)
Spy Phrase Mnemonic Password (+2)
Staggered breaks to reduce peak load (+3)
Stair cupboards (+2)
Starter warfarin (+3, -3)
Stochastic rounding (+4)
Stochastic voting system (+2, -1)
Streetview Advertising (+1)
Team Golf (+5)
Telomerase jujitsu (+1)
The giga-Raffle (+7)
Thermal busbar (+6)
Through-pocket Trousers (+4)
Time Capsule cavity wall insulation (+6)
Tiramisoup (+16)
unique dress business (+4)
Universal Archival Data Format (+3, -1)
Universal food labeling (+1, -2)
Universal homeopathic treatment (+7, -4)
Upcycling centre (+2)
Wadoorfall (+4)
water-sheet shower curtain (+12, -1)
Yard of cocktail (+9)
You know what I just don't care (+6)
Zebra wrap (+3)
Zen crops (+8)

random, halfbakery