(USA) First cussing customer

I got many complaint before, but never a cuss. I got a first cussing customer after working for almost 1 year now, he was like mother******, if that make sense with a angry tone and throwing his coins at me out of anger while taking his order. But that was it, his anger didn't continued after that so it was pretty short, and other customers was defending me too by telling him to be nice. :D