But if they don't accept unrolled pennies as payment, (you can be required to roll all coin and put your name and phone number on each roll) doesn't a warrant for dad's arrest go out? If your dad was complaining about a ticket for somethng that the camera shows he did, I can imagine what he'll say to you when he's unexpectedly arrested. No way I would put my dad in that position.
I once watched an episode of 'Parking Wars' where two guys went in and tried to pay in all pennies, with one of them filming because they thought it would be funny. Long story short, two police officers were called in and the end result, the business did not have to accept the unrolled pennies as payment, so the joke ended up on the impounded vehicle owner.