People that have a stench. Like, don't actually take showers or use deodorant. I'm not talking about the less fortunate souls out there who don't have ACCESS to these kind of amenities, but the people who choose not to use them. Case in point...there's a gas station right next to my apartment on colorado and I 25. Twice a week, there's a tall skinny guy that LITERALLY stinks up the entire building when he's working. There's a palpable rancidness that wafts into your nostrils as soon as the door opens.
W. t. f.
I guess what really grinds my gears is knowing that someone doesn't care enough about their own personal hygiene need to complete basic acts of sanitation.