I actually got my first few tattoos done on Friday April the 13th, a shop in Hamilton had a poster with a bunch of different things but they all had 13's in them, they were $13 each and all the money went to a charity. I thought that was pretty cool, my artist also informed me that none of them were being paid and were just there to raise money.
I was lucky enough to talk my way out of having any 13's put in my tattoos :)