He thinks he'll have a little fun with the old rabbi , so he says, "Rabbi, what do you do with the drippings from the candles?"

The rabbi says, "We send them to the candle factory, and every once in a while they send us a free candle."

The kid says, "And what do you do with the crumbs from your table?"

The rabbi says, "We send them to the matzoh ball factory, and every once in a while they send us a free box of matzoh balls."

The kid says, "And what do you do with the foreskins from your circumcisions?"

The rabbi says, "We send them to the IRS, and every once in a while they send us a little prick like you.".