OK these are bad.
1. So a seal walks into a club.
2. A horse walks into a bar and the bartender says, "Hey, why the long face?"
3. A pickle, naked chicken, and a wilderbeast walk into a bar. The bartender says to the picke, "Hey you can't have a drink."
and lastly,
4. Wanna hear a dirty joke? A white horse fell in the mud.