"Infidelity" joke

Part 1
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A man who just got a raise decides to buy a new scope for
his rifle. He goes to a rifle shop, and asks the clerk to
show him a scope. The clerk takes out a scope, and says to
the man, "This scope is so good, you can see my house all
the way up on that hill". The man takes a look through the
scope, and starts laughing. "What's so funny?" asks the
clerk "I see a naked man and a naked woman running around in
the house", the man replies.
The clerk grabs the scope from the man, and looks at his
house. Then he hands two bullets to the man and says, "Here
are two bullets, I'll give you this scope for nothing if you
take these two bullets, shoot my wife's head off and shoot
the guy's dick off". The man takes another look through the
scope, and says, "You know what? I think I can do that with
one shot!"

Part 2
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Three women are having lunch, discussing their husbands.
The first says, "My husband is cheating on me, I just know
it. I found a pair of stockings in his jacket pocket, and
they weren't mine!" The second says, "My husband is cheating
on me, I just know it. I found a condom in his wallet, so I
poked it full of holes with my sewing needle!" The third
woman fainted.

Part 3
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One day, little Billy comes home from kindergarten for
lunch. Not finding his mother in the kitchen, or the living
room, he heads upstairs to check her bedroom. He opens the
door, and what does he see, but his father, who had also
come home for lunch, stripped naked, on top of his mother,
also naked, heavily into the act of lovemaking. Not wanting
to traumatize the boy, the parents continue as if nothing
was wrong.
Billy watches, and after a couple of minutes asks, "Daddy,
can I climb on and have a horsie ride?" "Of course, Son,
we're a family." So Billy climbs on and after a few more
minutes his mother starts moaning and writhing wildly. "Hang
on Dad!", cries Billy, "this is where me and the mailman
usually fall off!"