Ok this is a really long, ronchy, awesome joke, and it's not racist, so don't worry
Okay, there was this boy and his dad. The boy didn't have to go to school that day so he asked his dad, "Daddy, can I take a shower with you?"
He said, "Ok, but don't look down."
In the shower the boy looks down and asks, "Daddy what's that?"
And he said, "Oh, that's my corvette."
THEN...
The next day, the same thing happened only with the mom and daughter.
"Mommy, can I take a shower with you?"
"Okay, but don't look down."
*girl looks down* "Mommy, what're those?"
"Oh, that's my garage, and those are my headlights."
THEN.......
That night, the two kids went into the parents' bedroom and asked, "Can we sleep with you tonight?"
They said, "Ok, but don't look under the covers."
They both look under the covers and the boy says, "Hey Daddy! Park your corvette in Mommy's garage and turn on the headlights!"
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Lol as appropriate.