I'll try to post a video later today.
Not really, I've hyperextended it a couple of times, but that was years ago and it wasn't anything that didn't fix itself after a few days. I don't get the same problem with the leg press machine, but then I'm probably not be doing a comparable amount of weight once my bodyweight (300ish) isn't involved. Bodyweight squats don't seem to cause problems initially, but it fires up once I add a bit of weight (like 90lbs). After it starts, even lighter weights/bodyweight is painful for a while afterwards. And no, no real stretching/foam rolling habit.