A man is sitting at the bar enjoying a beer, when the fellow opposite him shouts, "Hey, I fucked your mother last night!!"
The guy is shocked but ignores him.
A few seconds later the same guy shouts, "Hey, I fucked her REAL good and Hard!!!".
Again he ignores the comment.
Finally the man shouts, " Yeah, I fucked your mother real good... Up the Shitter!!!"
The man, unable to ignore these insults any further stands up and says "Ok Dad, it's time to go home". 
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