At the end of term I gave a class a teaser, make just one word from the letters DEJNOORSTUW, I barely got out of there alive.
A similar reaction came in a mental test, In a non-leap year, how many months have 28 days?
A man walks to the top of a hill and can see for 15 miles. The next week his girl friend walks up there with him, the weather conditions are the same,how far can they see?