The Blind Beggar
A blind beggar had a brother who died. What relation was the blind beggar to the brother who died? (Brother is not the answer)
The blind beggar was the sister of her brother who died. This puzzle is one of a type that depends on the listener making implicit assumptions about gender - in this case that a blind beggar is a man. Similar puzzles involve surgeons who refuse to operate on their sons etc. This is probably the best of the class because it is very simply stated and yet which has the power to baffle those who have not heard it before.