A priest and a rabbi operated a church and a synagogue across the
street from each other. Since their schedules intertwined, they
decided to go in together to buy a car.
After the purchase, they drove it home and parked it on the
street between them.
A few minutes later, the rabbi looked out and saw the priest
sprinkling water on their new car. It didn't need a wash, so he
hurried out and asked the priest what he was doing. "I'm blessing
it," the priest replied.
The rabbi considered this a moment, then went back inside the
synagogue. He reappeared a moment later with a hacksaw, walked
over to the back of the car and cut off two inches of the
tailpipe.