I'll admit that I once overfilled my 29 gal. I got distracted scraping spot algae off the nearby 58 gal. Fortunately, only a few cups of water got on the carpet.
A worse accident happened when I was refilling a 10 gal in my bathroom. I accidently knocked over some rockwork with the python, and I tossed the still-running python into the tub behind me - or so I thought. Suddenly, my socks were soaked, and I looked down to see the python at my feet soaking the carpet. The bathroom carpet is jigsaw-style tiles, so I only had to pull up the soaked tiles and hang them up to dry overnight.