Because...
(I'm told) alcohol thins your blood, so when they start tattooing you, you bleed more than you usually would. This makes the tattooists job harder, and might mess up your tattoo.

I know a guy who is evidence of this, and it's not as good as it should be. Make sure you eat first, too!

Also, what Clenders said. My mum went nuts when I head my eyebrow pierced at age 23. But when I had my first tattoo (when I was 19), she was completely fine with it. I think that's because you can't see it though...
( Devil_In_Tights the *real* DiT!, Mon 23 Feb 2009, 17:30, Reply)