Two crocodiles were sitting at the side of the Thames at Westminster. The smaller one turned to the big one and said "I can't understand how you're so much bigger than me, we were the same size as kids, I just don't get it!"
"Well," said the big croc, "what have you been eating?"
"Politicians, the same as you," said the small croc.
"Well where do you catch them?"
"Down by Parliament on the other side of the river."
"Same here, how do you catch them?"
"Well I crawl under their car and wait for them to unlock it, then I jump out, grab them by the leg, shake the shit out of them, then eat them!"
"Aah," said the big crocodile, "There's your problem, you're not getting enough nourishment. See, once you shake the shit out of a Politician there's nothing left but an arrsehole and a briefcase!"