I blew a chance to have an A2000 given to me by my parents when the A2000 was brand new - does that count?
As far as physical abuse, let's see...I broke a cold solder joint in my A520 composite converter for my A500 which forced me to wedge a book under it and keep it at a weird angle to make the video work - caused a loud buzzing from the speaker of the TV I used at the time, and eventually killed the CIAs in the '500 (thank goodness this was a time when you could find stores - plural - that'd fix Amiga systems).
