I have some good ones.
1. This effeminate personal trainer at my gym who can't be more than 130lbs who trains these 40+ gold digging women with a ton of low weight cable + exercise ball + resistance bands + doing two workouts simultaneously high rep "exercises." I call him Inspector Gadget because of his assortment of funny toys he uses. Funny aside - I slept with this girl in my nutrition class at college, and it turned out Inspector Gadget was her boyfriend...
2. This 50 something year old guy doing smith machine bench presses, while in between eye-fucking every girl in there, did these two inch ROM (at the most) with one plate, but instead of changing the weight, he kept on just putting 10lb plates on there. By his like 9th set, he had one plate, and like 8 10s on it...
3. This chipmunk looking old guy who basically used a leg extension machine like a throne and we were his royal subjects. I've never seen him use it. I'm serious.
4. This old lady who was using the only free flat bench at peak hours like a shelf for her water bottle, towel, and other assortment of garbage. I asked her if she was using the bench, she said yes, and then proceeded to do wall slides or some other silly exercise, then I asked if I could move it, she said no, she was going to use the bench, THEN DID ANOTHER SET. I threw her shit in the trash and did my bench press.