There's a Clock in the Window

Out for a stroll early Sunday in the old part of town a tourist sees a shop with a big clock in the window. It's open. The fellow's watch is broken, so he decides to go in and have it fixed.

“I don’t repair watches,” states the proprietor. “I am a mohel. I perform the ceremonial circumcisions in the Jewish tradition.”

Flabbergasted, the man rejoins, “But, you have a clock in the window!”

“So, mister, tell me ... what would you put in the window?”