My favorite is an old classic... so simple yet everyone i've asked gets caught out.
A passanger jet crashes right on the border between Scotland and England the plane is a complete wreck and bursts into flames. When the police turn up they are faced with a dilemma. Where do they bury the survivors.
Obvious answer when you read it. But say it out loud to someone and they dont take in the details..... They answer "england" "scotland" or "their country of origin"
Obviously they wont bury the SURVIVORS
