Outsmarted

A man was sitting on a London train eating a bag of fresh prawns, ripping off the heads and shells and then throwing them out of the window. After he had gobbled a few of them down an older woman opposite him said, "Would you mind not doing that? It's disgusting to watch."
"Listen, love." He replied, "It's got nothing to do with you, I've paid my fare for this journey and I'll do what I damn well want on this train." He carried on ripping off the heads and shells, throwing them out of the window and eating the prawns. Finally he finished the bag and settled back for a little sleep.

The woman then started knitting and all the man could hear while he was trying to sleep was the incessant clicking of her knitting needles. After a while, he sits back up and says to the woman, "Could you stop that noise, can't you see I'm trying to sleep?"
"It's got nothing to do with you," replies the old woman,"I've paid my fare and I'll do what I want on this train."
At that, the man grabbed the woman's knitting and threw it out of the window. The woman immediately stood up and pulled the train emergency cord.
The man burst out laughing and said,"ha ha, you'll get fined 200 quid for that!"
To which the old woman replied, "And you'll get six years when the police smell your fingers!"