Definitely some crummy (good) stories here. EYEDENTIST- that sounds similar to what Vic Martinez did when he tore his quads doing lunges. I don't know all the details, but I remember his describing them as the variation where you step backwards, and that it wasn't even a very heavy weight at the time. Isn't that always the way?
Still, as much as it mess him up and sidelined him for a while (a year maybe?), after seeing him at this year's NY Pro, I'd say he's most definitely returned to his previous form.
Branch Warrem is another one. He tore his tricep (I think it was his tricep, definitely his arm -lol) after slipping going down a flight of stairs, and grabbed the railing to catch himself. Less than a year later he stepped onstage and nabbed his 2nd Arnold Classic title.
Obviously guys like these two make use of 'supplements' that certainly aid in the regrowth of muscle tissue, but still, these aren't little strains and tears we're talking about, we're talking about things ripping off of bones.