This happened to me at an LA fitness. I was finishing lat pulldowns and the entire time I was eyeing the HAMMER row machine and thinking if no one grabs it I will do those next. I finish my set and the HAMMER is still empty, so I walk over, take off the 10 pound plates and put on 45s and midway through my set some old bald fuck comes running over yelling "I WAS USING THAT" I told him, I watched it for 5 minutes and it was empty so no he wasn't using it. He starts huffing, "YOU'RE MESSING UP MY SUPERSET" Again I look at him and say, I didn't even see you in this area of the gym and he replies "I DID BENCH, FINISHED UP TRICEPS AND THEN WAS GOING TO FINISH MY SET HERE" So basically this guy is doing a full length of the gym twice for his set. I was even nice enough to tell him he can work in if he wants and he just mumbles and walks away.
Fucking crazy people in public gyms. Glad I workout at home now.