What is the stupidest shit you've seen at the gym lately?

Today I was at the gym and this guy was doing lat pulls. Each rep he stands up about half way then falls back so his body weight and momentum pull the weight up. Then when the weights fall back down, they nearly yank him off his seat for his next rep. I was laughing and wanted to tell him he was wasting his time. I wanted to say what's the point. He wasn't using any muscle movement at all.

Another thing that get's me is when I see little 175lbs dudes walking around with their arms out and a big breath of air in their chest to look big. When you're big you look big and don't have to do that.