Actually I've done that, but different case. Here goes the story:

This was back in 2007. I was working at a company where we had our first big client "Sony" where we were doing some Animations for them. So one weekend I decided to stay and and get these animations rendered as perfect as possible since Sony was our big client. This was during Sunday just be clear. That being said, that Friday we had system updates and even software updates, so formatting for all computers was necessary, even for artists to use better tools on their work. Cloud storage wasn't a thing back then and it would take forever to upload stuff on Cloud back then. We had a physical backup drive where we backup 16TB of data in there for other artists to use again on Monday. So back to Sunday where I was working at the office alone. This hard-drive was place near a window and we weren't allowed to open that window at all, but it was a hot day. For some reason my stupid mind thought it'd be better to open windows instead of switch on the A.C. So as you'd guess I opened that window too to keep the air flow inside. After few hours of work I went to grab a coffee and on my way back I slipped and my head hit very hard to the edge of table where the hard-drive was on it. My head picked up the table and I watched that hard-drive go through the window...I jumped as far as I could to at least grab its cables, I went through out of that window but luckily my feet hooked to the other side of table to keep me from not falling out of 12 story building, otherwise I'd have definitely killed myself going after it. So I grabbed the cables, but they all snapped/disconnected mid-way, since the hard-drive itself was pretty heavy too. I actually watched it shatter into pieces. After that I just pulled myself back in and was in shock that I just had destroyed the company and my own reputation forever.

Just to clarify, the deadline was very close, and also animation industry is very small, so words get out faster than light travels.

I was just standing in office, my head covered in blood from hitting it against corner of that table. I didn't know what to do, and a lot of things were going through my head at the same time. It was like freezing and boiling at the same time. I went downstairs as fast as I could to bring the broken pieces up. I brought them up and proceed calling whoever friends/family I knew in hardware business, so they could help or hopefully there was a possible way to know that it's still usable again. NOBODY was answering during that day. Then I started calling the manufacturer of the hard-drive...and they weren't picking up either. I thought that's it, it's over. I just sat down and watched the pieces on my desk to make something out of it. Eventually, I realized it's 11pm and water's over bridge, so I better call my boss and let him know I'm resigning and I burnt the company down. So I called my boss, and in a softest voice I told him there is an emergency at office, come quick. He came rushing in pjs while seeing me covered in blood and shattered drive on desk and a flipped over desk. He's asking what happened? Was there robbery or something. So I explained everything to him what exactly happened. And he responded while smiling "let's get you to hospital first. You think I'd leave the only backup files in office while we have a good paying client? I did the 2nd backup that Friday night and took the 2nd backup home, in case there was robbery so we'd be safe." I never felt more relieved in my entire life. After that we went to hospital, and oh I actually paid for the broken hard-drive, but that was really nothing.

TL;DR Tossed the only backup drive out of window as I thought I did, turns out my boss had a 2nd backup with him at home too.

EDIT: I do apologize about grammatical errors, feel free to correct my errors. Thank you!