Tattoos are a good idea if you want to be easily fingered in a bank robbery or need to affiiate with the Mafia Mexicana in the penitentiary. Tattoos also make sense if you are anxious for a little Hepatitis-C or don't want to get into Jewish heaven.
All of the cons are worth it, though, if you want the world to know how much you love butterflies, now and when you're 79.