1. A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it? 2. A sundial has the fewest moving parts of any timepiece. Which has the most? 3. What is unusual about the following words: revive, banana, grammar, voodoo, assess, potato, dresser, uneven? 4. In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be? 5. A man takes his car to a hotel. Upon reaching the hotel, he is immediately declared bankrupt. Why? 6. You’re standing in a hallway with three light switches on the wall, each of which turns on a different lamp inside a closed room. You can’t see inside the room, and you can’t open the door except to enter the room. You can enter the room only once, and when you do, all the lamps must be turned off. How can you tell which switch turns on which lamp?