Presumably a reference to teen/vampire references, in the kin of the TV show True Blood, but I had to look that up, and I still don't understand the connection?
What do you call a cat on a bus? A Pussenger.
A crazy person walks into a bar, the barman says, sorry we don't serve nuts.
A nut walks into a bar..........it's never going to happen.
Answer immediately...What do cows drink? How many people said milk? They drink water! Only as calves do they drink milk, not technically a cow yet.
Those I get, when you need to Google, and still don't get the joke...