A young hotshot gets a job with the ATO. His first assignment is to audit an old rabbi.

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 answers, "To the candle factory we send them and every once in a while they send us a free candle."

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

The rabbi contemplates before answering, "These do we send to the matzoth ball factory, who in turn occasionally send us a free box of matzoth balls."

Finally the young man asks, "So what do you do with the foreskins from your circumcisions?"

After careful deliberation the rabbi instructs, "The ATO is blessed with these so they may periodically send us a little prick like you."