6.1: A man walks into a shop and asks for a glass of water. The shopkeeper brings out a gun. Why?
Answer: The man had hiccups and the shopkeeper wanted to scare him into stopping.
6.2: Romeo and Juliet are found dead on the living room floor. There is water all around them and there is glass on the floor. The window is wide open. What happened?
Answer: Romeo and Juliet are goldfish. A cat came through the window and knocked over their bowl.
6.3: There is no light in your wardrobe but you know there are 11 black and 11 blue socks in there. How many socks do you need to pull out to make sure you'll have a pair?
Answer: Three. You will have at least two of the same colour. (Mind you, if you don't care about colour—and many people would say that engineers don't—then you only need to pull out two!)