It's definitely not as good a joke as the bloke who walked into the pet shop to ask how much the wasp was that he'd just seen in the window.
It's not even close to being a funny as the time a guy walked into a doctors office and said 'Doc I've got a problem - Everytime I look at myself in the mirror when I'm naked I get an erection" Doc said "That's because you look like a cunt"