Usually, teachers told me that I was very intelligent, but didn't fulfill my potential. An English teacher once wrote on my report card that I'm too sarcastic and negative, which I kind of took as a compliment. Definitely a step up from a math teacher informing my Mom that I had nothing to offer in class.
It's weird, but even in college as an adult, a lot of my teachers seem almost threatened by me, like they have to be 10 times more critical and nitpicky about my work than anyone elses. One of them even tried to correct my pronunciation (and she was wrong) of "neue helvetica" when I said it during a presentation, as if she were searching for something, ANYTHING, to nail me on, just to make sure I knew who was boss...or something.
Other than that, I get the patronizing "we're proud of you" talk when I'm down sometimes, even when I haven't really accomplished anything.