aahhh this reminds me of my disasterous kickrom upgrading attempt last year. It was a fine april evening, and I came home very anxiously to replace my 3.0 roms with the 3.1 I brought from home. I didn't do this before, but somehow I thought it should be an easy thing to do (I have a lot of experience with pc hardware). I just took off the old roms, and put in the new ones, but while I was putting them, I thought oh I may have placed other way around, but surely it shouldn't be a problem, roms shouldn't burn with such a miss. When I turned on, the roms heated, especially one of them heated more so I thought I put that one other way around, so I flipped it. when I turned on, the same rom heated again, then I flipped them both. Then the same one heated again, so I thought I should switch their places, and did so. They heated again ... Then while I was thinking what to do next, (by the way, I was suffering from jetlag, after a 12 hour flight) I saw one of the 3.1 roms inside the box I brought them. Then it occurred to me that while I was leaving home, I put a spare 1.3 a500 rom inside the box 'just in case' (just in case I couldn't toast the roms by messing up the oreintation :-D ). So yeah I was trying with an a500 rom all the time. The 3.1 rom was ofcourse toasted, but the amiga was allright. Just the internal expansion port is fried, but I think it was fried before I did the kick rom attempt. This a1200 was a friend of mine's, who kept it in a cellar without the expansion port cover for years. Expansion port was pretty bad in shape when I got this amiga.
To cut it short, don't underestimate kickrom switching, don't come near to your amiga when you're drunk or jetlagged, don't put kickrom chips in the same container by any means. And don't think you're only one doing stupid things, world is full of stupid people, unfortunately (or fortunately ?).