One of my co-workers and I were bored and irritated at our manager and the big orange box so we decided to change the receipt heading on our last day. Being that our manager loves White Castle we thought his new name was appropriate. Also the phone number is now the rejection line out of NYC.
We found a terminal with no cameras and one of our buddies who had been fired lent us his user name.
The receipt printed all day before they could change it back. :-)