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I think I heard that one before.

what about "let's get off Moms because I just got off of yours" ?

Heard that even more.

Did you just get a Mom's joke book for your Birthday?

Yes, your Mom sent me one for my Birthday :). Now that I'm all out of Mom jokes I hope she sends me another one this year so we can continue this hilarious banter.

Consider yourself lucky, I didn't get anything but socks and underwear for my birthday.

my socks are Holy