I'm sorry, but this thread is pretty ridiculous. It seems like a lot of the comments here are "some guy was doing an exercise not endorsed by Rippetoe so he's an idiot!".
Some guy doing squats on an exercise ball while naked is something to notice in a gym. Some skinny guy, who doesn't know better, doing half bench presses isn't.
I also don't understand how people get upset by anything in a gym that doesn't directly affect them. E.g. I can understand getting upset if an unwanted spotter lifts the weight for you on your last rep. But shit like 'I saw some guy doing 405lb quarter squats thinking he was the man and it infuriated me'...who the fuck cares? There will always be people in the gym who don't know better and/or don't want to learn. Why does this matter to you?
Don't be a buzzkill. This thread is about documenting the silly bullshit, the real silly bullshit, not half squats and squat rack curlin'. For example, the feller who likes to load the cable machines up with weight, hold on to both handles, walk about 10 feet from the machines, do some strange punching moment for about 12-18 reps before he fatigues and the weight snaps him back into the machine.
Or the guy who does Randy "Macho Man" Savage "Oh yeahs" between heavy quarter squat reps. Or the two man faggot team tearing ass after each shitty power clean, which would be dropped immediately on the ground, no bumpers, no platform. Or the gym employee telling them that dropping their mighty 175 lb power clean would cause the bar go through the fucking floor.
Now I'm not upset (except for farting after each rep and giggling about it) I find it funny and amusing.
http://www.youtube.com/watch?v=OZc6J89b1-E
Marius Pudzianowksi does them. Personally I hate the idea of doing anything behind the neck.
It's called a snatch balance; it's an assistance exercise for the snatch: http://www.youtube.com/watch?v=idyhuDgmpuUThese are a legit exercise used by weightlifters, sometimes in snatch grip as well.
I joined a gym last week... been a long time since I was in one of those places. I haven't had a chance to notice much, but I really don't like the sales people... so effing pushy.