Back in the day I was putting firecrackers up Battle Armor Cobra Commander's torso but he never really exploded, just got a little black...I got so frustrated that he wouldn't die (I really hated that version) that I eventually just held a lighter to him.....I still refuse to get a good version of that figure to this day (Except for the 25th one, that one I love for some odd reason
As for breaking things now:
When I started recollecting back in 2003 or so, I had a Zartan or Hooded Cobra Commander (I forget which) that I just had to have sitting on the Ferret. As soon as I pushed him down on the seat, his crotch broke clean off.
about 5 years ago or so I worked out a trade for some Starduster helmets. The first one I tried to put on my figure had shrunk over time and was a little too small now.....it cracked down the middle and is barely holding together now (Thankfully I had two more helmets to use)