OK, funniest thing I've EVER seen, bar none, at the gym
We've got this guy we call "full stack" at they gym. He's your average guy... some extra fat... not skinny, but some muscle. No definition, probably 6'2" or so. Anyway, he works damn near every day I'm there... so he's there a lot and he hasn't changed in the two years I've been at the gym.
He's one of those guys that will do as much as he can with back arched, no form, uses all of his bodyweight, etc.
He's going to do THIS exercise.... not exact but close to the same machine
http://www.exrx.net/WeightExercises/LatissimusDorsi/LVFrontPulldown.html
And we notice he's going to do the "full stack." I watch with amazement as he jumps in the air and pulls the levers down, the weight go up, and because of the weight imbalance of the machine, it literally flips over. THE WHOLE MACHINE!!!! The whole gym is standing there in absolute awe at this point... trainers rush over, everybody rushes over, etc. No one was hurt, machine didnt miraculously hit anyone, and all was good. My buddy and I injured ourselves laughing though....
So now when one of us is going to do the full stack on the machine... well, you know what's comin... "good luck full stack.."