A guy was driving his truck along the interstate, when he admitted to his wife that he had screwed around on her. She proceeded to cut his penis off with a hunting knife, and throw it out the window.
The penis whizzed through the air and landed momentarily with a "SPLAT" on the windshield of the car behind, before sliding off. The little girl who was riding with her father yelled, "Daddy! Ew, what was that? I'm scared."

Her father said, "Don't worry honey, it was only a bug."

His daughter said, "Wow, that bug really had a huge dick!"