Ill name a couple 1) Guy who walks over by you and passes gas in the middle of your set. 2) Guy who wont leave the smith machine,ever 3) creepy older guy with mustache that hasnt gotten in any better shape and has been doing the same routine 3 times a week for years; when he says hi. 4) Obnoxious moaning. 5) fat people doing more ab work than cardio. 6) people sitting on a machine you want to use in between sets 7) leaving weights on the bars. 8) that guy checking himself out constantly, dont be him. continue list.