Heh. I almost always got straight As as a kid, except for gym and occasionally social studies/history. My grades dropped a lot when I started suffering from depression when I was 11, but it was from lack of motivation rather than lack of ability.
I don't really feel like I'm all that smart, though. All I do is just read, pay attention, and tinker a little. IMHO, everything I know and know how to do is stuff that almost anyone could learn if they just paid attention and read the instructions. So I hate it when people try to call me a "brain" or something.

I was a very hyperactive, bratty kid, and I was a total motor-mouth, so my teachers couldn't stand me back then. When I eventually "matured", I became pretty quiet for the most part, although I could still be talkative when I felt I had something to say.
Once I did mature, I don't think my teachers had much of an impression of me other than "solid student". Doesn't stand out much, just quietly does her work and usually does it well. I'm like that at work, too, actually.
I do know I worried my teachers a little at times, because my creative abilities and sense of humor have always been a tad morbid/demented.

When I'm on my "free time", I have a healthy sense of humor, albeit a usually somewhat subtle, dry, and "straight-faced" one. I tend to come off as a little humorless at work/school sometimes, though, just because when I'm concentrating on working I relate everything I do, say, and hear to just getting the job done. So joking comments I ordinarily would understand/enjoy while not working tend to trip me up/piss me off when I am working.
Peace & Luv, Liz