1. Jackel snipers in Halo 2 legendary: Lets give an enemy a long range gun that one shot kills you and give them auto aim. Now lets put dozens of these enemies on every rooftoop. I swear the level I'm thinking of must only beatable coop or by gernade jumping to areas that shouldn't be accessable. At least I haven't been able to beat it any other way.
2. Bad teammates in Dota, LoL, HoN, and moba: No I'm not one of those assholes that yells at someone for feeding. But it doesn't change the fact that it really, really sucks when you get a bad teammate in one of these games and everyone is compatent on the opponent's team.
3. Hammer Bros in super mario bros: Maybe it's because it's the first none turn based video game I ever played. But back when I was a little kid, meeting up with those brothers meant many agonizing deaths before I managed to luck out enough to get past them.
