For me, the worst line ever uttered out of Yoda's mouth in all the Star Wars movies.
PS: Excuse me for going off topic, but I found this line on IMDB that just cracked me up: "I killed them. I killed them all. They're dead, every single one of them. And not just the men, but the women and the children, too. They're like animals, and I slaughtered them like animals. I HATE THEM."