The Inland Revenue send their auditor to a synagogue. The auditor is doing all the checks and then turns to the Rabbi, " and says, "I noticed that you buy a lot of candles."
"Yes, " answered the Rabbi.
"Well, Rabbi, what do you do with the candle drippings?" he asked.
"A good question, " noted the Rabbi.
"We actually save them up and when we have enough, we send them back to the candlemaker and every now and then, they send us a free box of candles."
"Oh, " replied the auditor somewhat disappointed that his unusual question actually had a practical answer. So he thought he’d go on, in his obnoxious way. . .
"Rabbi, what about all these matzo purchases? What do you do with the crumbs from the matzo?"
"Ah, yes, " replied the Rabbi calmly, "we actually collect up all the crumbs from the matzo and when we have enough, we send them in a box back to the manufacturer and every now and then, they send a box of matzo balls."
"Oh, " replied the auditor, thinking hard how to fluster the Rabbi.
"Well, Rabbi, " he went on, "what do you do with all the foreskins from the circumcisions?"
"Yes, here too, we do not waste, " answered the Rabbi.
"What we do is save up all the foreskins, and when we have enough we actually send them to The Inland Revenue
"Inland Revenue. . .?, " questioned the auditor in disbelief.
"Ah, yes, " replied the Rabbi, "The Inland Revenue"
. . . and about once a year, they send us a little prick like you"