Answer:
What is the difference between yesterday and tomorrow?
There are two sisters: one gives birth to the other and she, in turn, gives birth to the first. Who are the two sisters?
Mary's Father had 5 daugthers. Monday, Tuesday, Wednsday & Thursdsay. What is the Last daugther's name?
What is the building that you leave without ever having entered.
Three doctors said that Bill was their brother. Bill said he had no brothers. Who was lying?
When is it bad luck to see a black cat?