I got mine because I figured it would be good for bets.

"Hey random person at the bar, I bet you a drink I have your name tattooed on my ass"

I don't drink anymore though.

Funnily enough, I did have a colonoscopy recently, and I did not mention my tattoo beforehand. Afterwards, when I regained consciousness, I told them I hoped anything I had said before being aware was harmless and entertaining, and the nurse said "You were plenty entertaining" :(