I would toss them all on the street and make a roadblock. Then I’d stand there and photograph people as they grab as many pennies as they can carry. That would be kinda interesting, because in all reality, you can’t really carry that many pennies. Once you get up to about $500 worth of pennies, it weighs 100 pounds. So if everyone takes an average of 100 pounds, then that would be 20,000 people.
There would have to be a rule that you cannot use any wheeled-device to carry them away. It would be by your own strength to carry the pennies. How much would people be willing to try to carry away? There’s a ten million dollars on the street, and if you can only carry away a hundred dollars, that’s only a tiny fraction of the total amount. Kokogiak did The MegaPenny Project where you can visualize different quantities of pennies, including one billion. It’s five solid school buses.