Kid walks in on his parents... (VERY rude)

[Azimov]

Kid walks into his parents room and sees his dad vigorously humping his mother.
As he stands there visibly traumatised, his Dad just laughs, throws a pillow at him and says "Get out of here you rascal!"
About an hour later the father hears a noise coming from the young lads bedroom so he enters to investigate.
Standing there in shock, he sees the teenager enthusiastically servicing his Grandmother.
"What the Hell are you doing?" screams the horrified parent.
"Not so f**king funny when it's your Mum eh?" says the kid.

[HelpfulHarry]

Ubfortunately, not so very rude that it hasn`t appeared on here several times already!