Knee Slappers

Son texting his dad

Son: Dad? What does mom have in between her legs?

Dad: The paradise,son.

Son:And what do you have in between your legs?

Dad: The key to paradise.

Son: Well some good advice dad is to change the lock, because it looks like the neighbor has a spare key.

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ok I know this isn't a "knee-slapper" but I've been waiting to tell that joke for the longest time and I finally can.