a boy is walking down the hallway when he hears a screaming coming from his parent's room. He opens the door and finds his dad in nothing but chaps, and his mom in a cheerleader outfit with no panties. He asks his dad:

"dad, what the hell is going on?" his dad replies "Nothing son just go back into your room, i'll come to tuck you in later."

the son goes back into his room. 20 minuted later his dad comes walking down the hallway and hears a screaming from his son's room. He opens the door and sees his son fucking grandma. the dad says:

"Son, what the fuck is going on?!" the son replies "Isnt funny when its with your mom is it!"