Pennies

Not much you can do with pennies except maybe collect them in a jar. I keep mine in a sort of jug. I saw a lady try to put pennies in a soda vending machine. She could only put in one penny because it kept rejecting it and would fall in the coin return. After a few tries she gave up. I felt kind of bad for her and pointed out a free coffee machine. She seemed happier. What do you do with your pennies?