At a Catholic school, a class of children are asked... Teacher: ""If there are three birds sitting on a wire and one of them gets shot, how many birds are left?"" Girl: ""There are two birds left!"" Teacher: ""Correct. What about you Johnny?"" Johnny: ""Zero."" Teacher: ""That is wrong. How do you get zero if only one bird was shot?"" Johnny: ""Simple. When the bird was shot the other two flew away."" Teacher: ""That's a smart answer but it isn't right."" Johnny: ""Okay, how about this?"" *He reaches his hands into his pockets* ""I am holding onto something hard, round and has a head. What am I holding?"" Teacher: ""Why Johnny! That's inappropriate!"" Johnny: ""How so? It's only a coin.""