When I was a kid, I tended to over-tighten all the screws, etc. Yes, I took the bottom heads off for awhile and made "concert toms"...but, fortunately, I never lost any of the parts. Yes, I set the toms at weird angles and hit the drums too hard and broke drumheads. Yes, I cracked cymbals. I snagged snare wires and bent them. I hauled stuff around without cases.
But, once I woke up, so-to-speak, I haven't damaged a single thing since. I am proud to say that I never laid drill to any drums in all my days!
Once, when I was going up a flight of stairs, the handle to my floor tom case broke and the case, with the drum inside, tumbled all the way to the bottom. After that, I think I must have delaminated one of the plies because the drum never "sang" after that. But that was an accident and an equipment failure.
So, how do YOU damage your drums?