I don't have one and although I sometimes consider getting one, it's unlikely to be honest. I'm not a fan of any of the usual styles of tattoo (e.g. tribal, skulls, Asian symbols) and also things from franchises, though I'm fan-boy of several media there's nothing I love enough to get permanently marked on my skin.
If I was to get one it would be something personal to me and so it would look strange to those who didn't know me well, something involving a lobster for example is the only thing I can currently think of that I'd be happy to have on me forever. The chances of me ever deciding on something enough to go ahead with getting a tattoo are pretty remote though.