Moth Problem A sales assistant walks up to an old lady in his store and asks if he can help. The lady says, ""Yes please. I have a bit of a moth problem at home and need something to get rid of them."" The assistant points out where the mothballs are and the lady thanks him and buys a packet. The next day she returns but this time buys TWO packets. The day after that she returns and buys THREE packets. On the fourth day she's buying FOUR packets and the assistant can't hold his curiosity any longer. He says, ""Ma'am, you must have an awful lot of moths in your house!"" ""Yes,"" she replies, ""I spend all day throwing these darn balls at them and haven't hit one of the bastards yet!""