I've never actually watched Azumanga Daioh, but Yukari's driving style CRACKS ME UP.

I've seen Himura Kenshin slicing trees with his sword. I've seen Inuyasha take out swarms of demons with Tetsusaiga. I've seen Ulquiorra causing explosions capable of leveling entire cities, but NONE of that is as dangerous as Yukari behind her car's wheel.