Answer:
Three doctors said that Bill was their brother. Bill said he had no brothers. Who was lying?
On which day of the year do fewest people die?
A man was sitting on his couch and searching for the English Channel. How did he find it?
What goes up the hill and down the hill, And spite of all, yet stand still?
The yellow house has yellow window, the red house has red windows, what colour windows does the green house have?
When is it bad luck to see a black cat?