I was waiting for a seat at my gym to do some ancillary arm workout or another (there's only 2 of the kind in the entire place). There's noone else around me, and when the dude was done with it I grab my weights and start to sit when this women grabs the back of the seat and says 'Hey, I'm going to use this.'
'I've been waiting here for a while, you can use it after me.'
She gave me the absolute chilliest, withering look I have EVER seen (If looks could kill, I would have been a charred, smoking corpse on the ground, that is how venomous this fucking glare was), and then replies with 'Really?' in the form of a statement. She was mid-late 30s with fake tits and weirdly defined muscles; one of those older broads that probably used to be hot and thinks that working out constantly will save her failing looks.
I held her gaze, nodded, said 'Yeah.', sat down, and started my workout. I could see her staring at me from the mirrors that lined the wall for a good 20 seconds after I started before walking away, shaking her head, and complaining to the meathead that she came in with.
In my experience it's always the older gym rats, especially women, who have the worst attitudes. I don't know why this is.