My A1200 took a flying lesson when I was trying to figure out my IDE interface and CD-Rom. Having to leave for work any minute I was rushing (bad idea) and balanced my amiga on the edge of the desk, still holding the cable attached to my Amiga I turned to reach for the CD-Rom or PSU and yanked it off the desk. :-o
Yikes. I lost the top quarter of my harddisk; it would just freeze up when trying to access the last gig.
Luckily the rest of my hardware survived and I think I've mentally blocked out the other falls my Amiga has taken.
Oh and blowing up something by swapping cables round when it's turned on will never happen to me!!! :-D