Got a (painless) tat...
Get your own knuckles at the knuckle tattoo gun.
I found this on BikeSnobNYC. Cool, no?
I've never been tempted to get a real tattoo, even when deep in my cups. Besides the fact that I'd probably cry like a girl, there's the realization that if I loathed the thing after a few years, it would be a massive PITA to be rid of it.