ive got a few more that might be funny, and none more inapropriate than above.
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teen girl - dad, can i borrow the car tonight?
dad - well, i dont no...
girl - please!!!
dad - ok, but only if you suck my di*k
girl - dad, that gross!!!
dad - u want the car or not?
girl - of course
*dad drops pants and whips it out**girl starts sucking*
girl - dad, your di*k tastes like sh*t!!!
dad - o ya, your brother already has the car.

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this is more of a corny pick up line than a joke but if you use it the results will be funny, for those watching anyway...

'hi there, there's 206 bones in the body, how 'bout another?'

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thats all i have for now but if i think of more ill post them...