IRS Tax Auditor at the synagogue

 At the end of the tax year, the IRS sent an inspector to audit the books 
of a synagogue.

 While he was checking the books, he turned to the Rabbi and said, "I 
notice you buy a lot of candles. What do you do with the candle 
drippings?"

 "Good question," noted the Rabbi. "We save them up and send them back to 
the candle makers, and every now and then they send us a free box of 
candles."

 "Oh," replied the auditor, somewhat disappointed that his unusual question 
had a practical answer. But on he went, in his obnoxious way: What about 
all these matzo (bread) purchases? What do you do with the crumbs?"

 "Ah, yes," replied the Rabbi, realizing that the inspector was trying to 
trap him with an unanswerable question. "We collect them and send back to 
the manufacturers, and every now and then they send a free box of matzo 
balls."

 "I see," replied the auditor, thinking hard about how he could fluster the 
know-it-all Rabbi. "Well, Rabbi," he went on, "What do you do with all the 
leftover foreskins from the circumcisions you perform?"

 "Here, too, we do not waste," answered the Rabbi. "What we do is save up 
all the foreskins and send them to the Internal Revenue Service, and about 
once a year they send us a complete dick."