A man is shopping when he notices a hot blond girl is staring at him After a while he asks her: ""I'm sorry, but do we know each other?"". She replies: ""Yeah, I think you are the father of one of my children."" The man knows very well he only cheated once and clearly remembers everything that happened so lowers his voice: ""Ah, then you must be the call-girl from my bachelor party that I was banging on the snooker table while your girlfriend was spanking my ass with the bullwhip."" The girl replies: ""I am a teacher and your son is one of my classes"".