A traveller in a strange town found that his watch stopped.
He happened to see a door with a big clock hanging outside, so he stepped in.
An elderly Jewish man attended him and he explained that his watch needed fixing.
The elderly man said ” I am sorry, sir I cannot help you, I am a mohel not a watchmaker”
The man replied, surprised ” If you are a mohel why do you hang a clock outside your door?” The mohel replied “Well, if you were a mohel, what would YOU hang outside your door?”
Credit: jewishjokes.net