A man walked into a bar with a riddle to tell... And he slapped down a dollar and a quarter. The bartender went to fill him a glass of beer and passed it over. The man took it and downed half of it. When he set it down, he asked the bartender, ""If a green man lives in the green house, and the red man lives in the red house, and the blue man lives the blue house, then who lives in the white house?"" The bartender already knew the correct answer, but decided to play along. Facing him, he tells hi…