There's no way someone survives something as big as a butt plug moving from their arse to their chest at near the speed of sound. You might as well put their internal organs though a juicer and see if they survive.
MRI machines have some pretty powerful magnets, but they still won't accelerate anything to the speed of sound, let alone an object held reasonably securely and only within the space of ~12 inches.
It's not a particularly large or sharp object; I could see it being pulled through the inside of a chest cavity mostly pushing stuff out of the way. Definitely 'major injuries' though.
