Police stopped a man with a pig in the passenger seat.
Why have you got a pig in the passenger seat, it's not allowed, take him to the zoo at once.
Next day police stopped same man, no pig, what happened to the pig ? Man says we had so much fun at the zoo that I took him to Sainsburys and they shot him and sold him for bacon. Police said, why didn't you take him to the theatre ?
Apparently I got the last part of the joke wrong and have just been roundly bollo**ed and excommunicated from MSN. Sainsburys are not involved and what actually happens is that the police stop the man again and the pig is STILL in the passenger seat and not missing. And the man says we had so much fun at the zoo that I took him to the theatre.