Family opening my door, but not closing it the same way it was before. I often have my door almost closed, and I hate when its like that and they close it. And same for if it was closed and they leave it open when leaving my room. OCD.
When my mom comes in my room while I'm asleep, whether it's at night or in the morning, and then leaves, if she closes the door to where it doesn't click into place and you can just push or pull it open, it annoys me. Our cats always know when the door is like that, so they'll just push it open and come in. My room's off-limits to cats, dogs, and people, after all.
The guy whose "brilliant" idea it was to breed bees and accidentally invent Africanized Bees. Great job, man. You created extremely hateful, super territorial, merciless murder bees who will send the whole darn hive after you and kill
Parasites. They actually have no purpose or use in the world, so why must they exist? I understand bees' existence. I understand ants' existence, as much as I hate ants. What's up with parasites, though, other than to make organisms suffer?