This would be useful for those carrying heavy shopping (yes this was inspired by the pushmepullyou thing) or extremely drunk people. It's very simple. Scale up fingerprint scanner; place in centre of door. Apply bonce to scanner; scanner recognizes bonce and allows entry, or does not recognize bonce and applies electric shock. Get away from my door, you freak!

Comes with free stepladder for dwarves.

Incidentally, does anybody else find the idea of an aircraft recognition competition screamingly funny, or is it just me? [does voiceover impression] "Is it a bird? Is it a plane? Yep, it's a plane."
-- moomintroll, Jan 19 2005

I suppose everyone does have a different forehead... but different enough for a fingerprint scanner to tell the difference? Otherwise it could lead to frustrating nights sleeping outside, anvil by your side, hair on end with static and a throbbing pain as your brain cells die from impact shock.
-- pooduck, Jan 19 2005


Monty Burns has a facial recognition system similar to this. See episode "Last Exit to Springfield"
-- xaviergisz, Jan 19 2005


Umn.

...

...how will it deal with bangs, glasses, and hats?
-- tiromancer, Jan 19 2005


Each person's head makes a distinctive sound as it hits the door...
-- robinism, Jan 20 2005


[robinism] I think there are only so many different types of 'thump' noise
-- pooduck, Jan 20 2005


Could always do a quick DNA scan, I guess. (I was rather perturbed to discover that I leave a head print when I lean against windows and shiny elevator doors.)
-- DrCurry, Jan 20 2005


//bangs, glasses and hats//reminds me of a public house version of "eats,shoots and leaves".
-- po, Jan 20 2005


Leaning forward past a heavy package is difficult. Use a softer portion of anatomy halfway down. Less painful to bounce against the door, too.
-- Shooter, Apr 05 2005


The spleen?
-- hidden truths, Jun 12 2005


I imagine the poor drunken fellows bashing their heads against the nearby walls, thinking, 'Ere, theesh door would be eeshier to open if I had a shtupid key'.

Maybe a coded knock?
"Knock-knock, , knock-a-tee-knock"

This would work if you stamped it with your feet, or hit your head at the wrong door, even.
-- Ling, Jun 13 2005



random, halfbakery