"You are having a bonfire and invite twenty of your classmates. They are all quite thirsty. The first asks for 1/2 cup of water, the second asks for 1/4 cup of water, the third for 1/8 cups of water ... etc. How manu cups of water do you need in total?"
Johnny and his Dad were at a carnival and both of them went to a booth where a carny said to the Johnny, "If I can write your weight on a piece of paper, you have to give me $100, however If I fail, I'll give you $200.? Johnny?s Dad looked around and saw no scale so he tells Johnny to agree, thinking no matter what the carny writes, Johnny can just say he weighs more or less. In the end result, Johnny?s Dad ended up paying the carny $100. How did the carny win the bet?