There once was a Mohel (the Rabbi who performs a briss) who kept all of his tips for 20 years and goes to a leather working shop...

He walks in and says "I would like to turn these into something to remember all of the children I helped."

The leather worker and owner of the shop says "Okay, come back to me in three days when I give you a call."

The Mohel waits three days, doesn't hear from the leather worker and calls back and the owner says "Yes yes, come in, we just finished it!"'

The Mohel walks into the shop and the owner delightedly hands him a wallet.

The Rabbi says "But this is just wallet ! I gave you 20 years worth!"

The owner of the shop says "Ah, yes, but rub it and it turns into a briefcase!"

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Resubmitted because I used the wrong term for the Rabbi, my mistake!