Screw-on bottle cap tripod almost useless, but kind of neat
This $10 screw-on bottle cap will allow you to mount any camera to the top of a bottle, transforming it into a makeshift tripod. Needless to say, you'll want to make sure there's enough liquid in the bottle you're screwing it onto before attaching your expensive digicam.
Bottle Cap Tripod [Charles and Marie via Gearfuse]

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What, no screw bottle wine joke?
Of course you could take your own bottle cap, drill a hole in it, and fit it with an appropriate sized bolt and nuts... but maybe it's worth $8 in labor and $1 for the thumb-nut at the top.
Gotta agree, though, that the question is "why". Where would one use this rather than a $6 folding mini-tripod?
Also, Make your own for about $3!
http://www.jakeludington.com/project_studio/20040723_diy_bottle_cap_tripod.html
Hey, what's with the floccinaucinihilipilification?
Yes, I am stupid.
Cory blogged this in 2004. :)
http://www.boingboing.net/2004/07/20/bottlecap-tripod.html
He posted the above DIY link the day after.
I made one, and it really comes in handy when you're wandering around a Theme Park in the hot sun, Trapped on Vacation with nothing but a water bottle and a camera. One thing to note though is that it only works with a point and shoot because of weight restrictions. I abandoned the idea when I upgraded to a DSLR.