My favorite is the following story / joke told about some Yeshiva students. One hot summer day these boys decided to cool off by taking a swim. A short while in to their swim, the owner of the pool came home and saw the boys in his pool and yelled at them "What the hell are you doing in my pool? Can't you read the sign?"
The elder student said "Of course we can read. It says (in Yeshivish sing-song voice)