When I was in college there was this "guy in the gym" about 180lbs, 5'11", greasy hair, some acne...well, he would do these things
-Read The Odyssey between sets.
-Talk to him self
-Do hand stand push ups for no reason
-Shadow box between sets
-Be very frustrated by seemingly simple tasks i.e. trying to do deads with a very narrow grip and having the bar sway up and down. He would drop the bar, yell at himself and try/fail again. He then came over to me (no homo) and asked if he could use my straps, I said yes, he put them on (not very well) tried and failed again only to freak out, drop the bar, drop the straps and storm out.
This was not an isolated incident.