What about those idiots who do use their turn signals, but only at the very last moment before they actually turn!
There are also those slow moving vehicles that when you pass them while cruising at a certain speed, feel that you want to race with them and they start going haywire all over the road and try to keep you from passing again. Sometimes they make a wrong lane choice, get stuck and then catch up with you again as if it's our fault that they're pea brains
And of course, slow movers who do not want to get out of the way!
Also, those who turn the wheel towards you even if they do not look at your lane to check if it's clear and nearly hitting you for doing so. Sometimes, they even have the nerve to get pissed at you for their stupidity!