My beer opener doubles as a fixed gear bicycle.
And no, its not one of those Surly chain tensioners w/ the bottle opener, nor is it the laser cut dropouts with the beer opener, it's not even a 'wisecracker' stem or seatpost-clamp beer opener, this one is 100% homemade.
The pics are crap-tastic (sorry) but the idea is simple-
Go to grocery store and buy a 2 pack of cheap bottle openers.
Hit the hardware store and pick up a couple bolts that mach the threads of the seat clamp bolts but are just a little bit longer.
While your shopping for hardware pick up a couple washers and nylon lock nuts too.
Grind the "pointy end" of the opener down so you don't hurt yourself.
Drill a couple holes in the opener that line up with the newly-extended seat clamp bolts.
Add the opener, some washers, and lock nuts on top.
Barely noticeable once installed but it cranks the awesome knob all the way to 11.
Cost- $1 for a 2-pack of openers, (2) $0.89 bolts, (2) $0.14 washers, (2) $0.22 lock nuts.
Total- $3.50
Cheers!