At one time I had a large collection of these magical undies, to which my cat was freakishly attracted. I would often struggle to open my dresser drawer against furry resistance after my cat had decided to take a nap with my undergarments.
This might seem mildly disgusting to a non-pet owner. Ha! One day I noticed that the magical undies were not providing their usual comfortable coverage, and in fact seemed to be downright irritating. After a fidgety day, I switched to another pair and forgot about it. Until a few days later, when again I found myself wiggling in my seat trying to distance myself from these dreadful scraps of fabric.
Mystified, I decided to investigate the home of the distinctly un-magical underwear. I pulled the drawer all the way out and that's when I found it. Right at the back of the drawer, with faint stains indicating it hadn't always been at the back, a small puddle of cat pee.
After a long, scalding bath and hysterical application of exfoliating scrubs, I finally felt calm enough to get dressed. Without underwear. One expensive shopping trip later, I had restocked and put a lock on my dresser drawer, but the trauma remains to this day. I'll never look at a thong the same way again.
And that is the most destructive thing my pet has ever done.