Me and my friend came up with a hundred of these one day:
Guy standing next a cop:
"Hey there, would you shoot that cop?"
"No way!"
"I've got a Klondike Bar.
"Just cal me the 'Klondike Cop Killer'!!!!"
Man walking by a mother in a store who is not paying attention to the stroller with her child in it:
"Would you steal that woman's baby."
"Are you joking?"
"Would you do it for a Klondike Bar?
Man runs and steals the stroller. The 19 year old mother doesn't notice.
We got plenty more but I'm too lazy to remember them.