Dear JohnA woman finds out that her husband is cheating on her while stationed in Saudi Arabia. So she sends him a very special care package. He is very excited to get a package from his wife back home. He finds that it contains a batch of home made cookies and a VHS tape of his favourite TV shows.
He invites a couple of his buddies over and they're all sitting around having a great time eating the cookies and watching some episodes of South Park.
Right in the middle of one episode the tape cuts to a home video of his wife on her knees giving his best friend oral sex.
After a few seconds, he does his business in her mouth and she turns and spits the load right into the mixing bowl of cookie dough. She then looks at the camera and says, "By the way, I want a divorce."
Now that's a Dear John letter...