Student 1:  "__________ just sneaked out into the hallway."
Me: (just loud enough to be heard in the hallway) "If _______________ is out in the hallway, where he doesn't belong, he owes me $500!"
________________ runs back into the classroom.  "How about I give you 5 million pennies instead?"
Me: "Sure thing.  I expect them on my desk tomorrow.  By the way, I have a homework assignment for you.  You need to figure out how much money 5 million pennies is worth."

There was not 5 million pennies on my desk the next day, but __________ did do his homework assignment.  He offered to give me the $500 instead.