First one, grinding in MMORPGs. But almost always, when I've got to such point in MMORPG I've had to grind, I just stopped playing this game.
Second, Wurm Online (maybe someone heard about it) - the possibility of making one sword is, like, 5% - and I've had to make 4 of them, for me and my 3 friends. It took me 2 hours of non-stop handle carving, blade smithing and trying to insert blade into the handle. This was so annoying. Everything in wurm has so low chance of success, it is just ridiculous. How come it is possible, that your character failed to insert blade in a handle in such a way, that he COMPLETELY DESTROYED both handle and blade, thus making both of them unusable? (The handle actually disappeared, and the blade turned into 'iron scrap')