Bad joke

You know the type of jokes you get on sms. I got one in German. Will make an attempt to translate. Gotta warn you though, it's not that funny. But here goes (and I'm in blogging mood :):

Peter, your zipper is open. It doesn't matter, it's an experiment. Last week I left my shirt open and got a stiff neck.

Hmmm, my sense of humour is perhaps different. I kinda like something that's funny :)