Hold the penny in your left hand. Get angry. Whatever makes you angry, think of it now. Make a fist around the penny and hold it up to your mouth. When you’re good and angry, start swearing at the penny, calling it nasty names, telling it ugly things. Go on as long as you like. (This is a great way to vent!)
When you’re done, say, “Pass it on.”
Drop the penny in the house of someone who’s annoyed you, use it to pay at a business that’s done you wrong, give it to someone you want to inconvenience, sow discord in the world for the lulz, go nuts. I used to charge ‘em by the handful and scatter them downtown when I was partially homeless and hated everyone and everything.
As some of you may have realized, you can use this as a way to cleanse! If you don’t want to weaponize the penny, say “Hold that for me” when you’re done charging, and dispose of it safely or cleanse the penny.
Do not keep the penny. Just do not. I once cursed a penny, dropped it so it landed in my shoe by accident, and had a stunningly shitty day. It takes ten seconds to cast if you have a penny and you’re already angry. Storing them up just means they go to work on you. So if you want to carry ammo, just keep uncharged pennies on you and charge them as needed.