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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.