things like this can happen - but that guys' a moron plainly - here is my story
I had a ZL f/lane with factory cruise and LPG with a backfire eliminator to save my o2 sensor from backfires yea - anyway long story short it backfired broke the backfire eliminator and sucked it into the throttle body jamming the butterfly
this kept the car in motion even though the cruise control disengaged when the brakes were stomped on, this is minutely related I know but no police were involved in some doofy highway hijinx or anything else for that matter, I got the car to stop by braking hard then going to neutral completing the stop and killing the ignition - it is scary yes but by taking some time to think while trundling down the highway I come up with a solution. Maybe his throttle jammed for some other reason unrelated to the cruise control like my f/lane?
But its just about a lock on a hoax some guy pulled to get his 15 minutes of fame.....