Ah, yes, Rufus has it right. Except Denny's is open 24 hours, so we...I mean they, used to gather around college campuses late night drinking free refills on coffee and complaining about the plight of the worker. Tipping the waitstaff like, a buck for dealing with smoking, non-food buying fuckwads for hours because funds were low.
I hadn't seen any restaurants here that are open 24 hours though, so maybe that's more of an American thing.