Wow, I guess this is not normal, then. I didn't think so.
I was telling my friend and she was cracking up as well. I guess it is kinda funny.
If he continues, though, I'm going to call the vet and ask what the story is. I think I'll contact the shelter I got him from and ask her if she's sure he's neutered. I can't believe that they would put him up for adoption without making sure he's a neutered cat.