A NEPA official walked into an eatery to rest while working in the area. It was a big eatery so everyone receives his bill written on a piece of paper. After a long rest he decides to leave.
NEPA OFFICIAL: Madam, I must be on my way now
MADAM: OK. You can pay your bill to the cashier there.
NEPA OFFICIAL: Sorry madam, but I didn't take anything.
MADAM: As you can see here, there's no light and yet we still pay our electricity bill.