Ahh yes, the good ol' "throttle-stuck-on-the-floor-mat" Happened a few times to me. I put new floormats in my dually recently, they have a dished shape to them to prevent water and mud and crap from flowing out onto the carpet. But the lip on the front catches the gas pedal, and once when i was accelrating, and when i went to shift it caught it right and pinned the pedal to the floor and then when i pushed the clutch in the rpm's just went to the moon. So what did i do.....panicked! lol So i hit the ignition and coasted to a stop. I figured out the problem pretty quick and solved it with a pair of tin snips

They are great floormats by the way!!
Good to hear nothing too serious happened to you or your truck Jk!