Split soda all over a Commodore 128 about 3 hours after I got it (note, it wasn't brand new, we were poor, so it was pretty outdated). It smoked, and never turned back on. I read the fuck out of that manual, afterward, and the programmer examples book that came with it. I was so, utterly, devastated. For years. I didn't get another computer until 3 years later.
God just looking at the wiki article makes my stomach turn remembering how stupid I was. Ugh!
The best part about it, however? I have never had another high money value accident since. Life lesson, right there. And I'm serious. I've had monitors fall off of desks, and caught them in midair, I've had high value quartz vases fall and caught them, or deflected them so that they wouldn't break. I sat down with a camera in my back pocket and instead of fully sitting down on it, it immediately clicked what I was about to do, and I allowed my entire body to push my chair backwards and over just to preserve my camera.
Ahh, good times. I'm actually kinda OCD about high value items these days.