I tend to watch a lot of animal videos on Youtube, and, unfortunately, that means I occasionally run across videos of people hurting animals for fun. Like this one time I was browsing some cute animal videos (jumping spiders in particular, I think), and I found a video of some ignorant dipshit tasing an orb weaver spider in their back yard, and then laughing about it. It's just awful that that sort of thing isn't considered animal cruelty in the same way it would be if the animal in question had a skeleton.
Although, if I recall correctly, I believe the video in question had more dislikes than likes, so at least there's some hope. The best case scenario is that it got flagged and taken down, but I haven't exactly looked it up again, so I wouldn't know if that ended up happening.