A man goes to New York and realizes he’s some how broken his watch.
He’s walking down the street and finds a shop with a window full of watches and clocks. Inside, there’s an old Jewish rabbi bent over a book, lost in his studies. The man with the watch approaches the storekeeper, “I need to have my watch fixed.”
“I’m sorry,” the old man answers, “I can’t help you.” He goes back to studying.
“What do you mean you can’t help me?” the man with the watch is angry, “Are you saying you don’t want my business?”
The old man glances up and says with a tired sigh, “Look, I’m sorry, but there’s nothing I can do.”
“There’s nothing you can do?!” The guy with the watch is now livid. “This is a watch shop. My watch is broken. I want you to fix it, now!”
Without looking up, the old man says, “I’m not a watch repairman, I’m a mohel.”
“What in the world is a mohel?” The man exclaims.
So the old man explains the process to the out of towner.
“Ok,” says the man, “Then what are all those timepieces doing in the window?”
“Look, mister,” the old man answers, “If you performed circumcisions for a living, what would you put in the window?”