Rabbi and Priest

A Rabbi and a Priest buy a car together and it's being stored at the Priest's house. One day the Rabbi goes over to use the car and he sees him sprinkling water on it. The Rabbi asked, ''What are you doing?'' The Priest responded, ''I'm blessing the car.'' So the Rabbi said ''Okay, since we're doing that....'' and takes out a hacksaw and cuts two inches off the tail pipe.