Science: Health: Diagnosis
running-on-empty hat   (+1)  [vote for, against]
A cap which changes colour when the wearer is too tired to process thought.

At the age of 29 I still harbour a grudge against the teacher who taught me tripple French on Friday afternoons. The reason is simple - he forced me to continue trying to learn a new language at a time when my brain had given up the fight.

No matter how much he shouted, bullied, or encouraged me, my grey matter was simply incapable of taking in more information come the end of a long academic week. Frankly it was a waste of his time and mine.

How easily this situation could be resolved if I owned a hat which changed colour to indicate that the wearer's brain has temporarily given up the ghost. Maybe a traditional colour scheme; green = eager to learn, red = away with the fairies.

The "running-on-empty hat" could work with a series of brain monitoring electrodes woven into a jaunty bobble hat, some kind of heat monitor, alpha wave sensors, telepathy, or plain magic.

Using a running-on-empty peaked cap would allow for self diagnosis by glancing upward.

There are obvious applications for call centre workers, bus drivers, computer analysts, pilots, etc.
-- Fishrat, Sep 18 2003

6 thinking hates by de Bono. whoops I mean hats.. http://members.ozem...hniques/sixhats.htm
no sign of dipsy's hat though [po, Oct 04 2004, last modified Oct 21 2004]

What EdZ was talking about [Fishrat, Oct 04 2004, last modified Oct 21 2004]

Is it relative or absolute? That is, does it only work on normally intelligent people who are zonked out, or does it warn about, ahem, natural brain tiredness?
-- yamahito, Sep 18 2003

*Ding!* Brain is full. Please insert next brain.
-- jivetalkinrobot, Sep 18 2003

gimme a no-vacancy-beret ... no mas ... all the time
-- Letsbuildafort, Sep 18 2003

Non flamma mentus.
-- silverstormer, Sep 18 2003

For some reason I thought this was a new flavor of Linus.
-- DrCurry, Sep 18 2003

Cover it with e-ink to make it low power, and use a veeeeeeeery tiny ECG.

Any I mean veeeeeeeeeeeeeeeeeeeeeeeeeery tiny.

It doesnt work without that last 'e'
-- EdZ, Dec 12 2003

random, halfbakery