The Zen Master is visiting New York City from Tibet. He goes up to a
hot dog vendor and says, "Make me one with everything."

The hot dog vendor fixes a hot dog and hands it to the Zen Master, who
pays with a $20 bill.

The vendor puts the bill in the cash box and closes it. "Where's my
change?" asks the Zen Master. 

The vendor responds, "Change must come from within."