Dunno about the worst thing but she was mightily offended for some reason.
Got off with a German girl in Lloret De Mar back around 1986, i was pretty inexperienced in the sack & couldn't believe my ears when she asked me to do her up the wrong 'un ( this was pre internet days & thus not everyone was anal mad lol).
Anyway, i did the deed & mighty enjoyable it was too, she then went down & blew me, the problem then was she proceded to try & kiss me afterwards & i freaked and told her i didn't fancy necking a bird with shit on her tongue.........she went apeshit & started throwing punches at my head, to this day i don't know what i said wrong or whether it was a language issue lol.