So i work in a book store. Barnes and Noble to be exact.
Working an overnight so no customers and I'm moving some books around.
Get two big carts full of hardcovers.
Try to go up the escalators with both. I have one in front and one behind me.
Get to the top and the front one is so heavy it doesnt hop the lip and gets stuck.
The escalator is now pushing me into this book cart.
The back one is now getting pushed into me. Im litteraly stuck between a rock and a hard place.
Both carts fall over thowing hardcover books everywhere. About 100 books total. Leaving me at the top swearing profusely and my boss and coworkers running over thinking I died.

You pulled a big fucky wucky and nearly ended up in the forever box.

No one likes to go to the forever box.
I guess my biggest fuck up was when I had a table on a tab and after about 40 mins (I work in hospitality) being busy with other things I realised I hadn't sent it through to the kitchen so there meals were not only very late but I felt like shit cause it was all my fault. Luckily they were lovely and understanding.

My biggest fuck up was back when I woked at a cantine (biggo company) and I was sent to get the desserts out of the cooler. It was one of those huge cantine tray trolleys, taller than me, with two trays on each tier, 12 porcelain cups with pudding on each tray. Welp, I pull on this monster to roll it and I didn't fucking notice that the brakes were still in, so that huge tower just tips over and falls on me. I couldn't do a thing, pudding and shards everywhere, and I was just sitting in this mess, tears in my eyes.
My boss came over (he was a very strict and serious man), saw me crying in my pudding-shard-mess, calmed me down and helped me clean up.

Thank god he was understanding about it.

My thoughts exactly. From then on I saw him more as a strict but understanding father figure.

That's super sweet

@mialinay and @texasranger : it looks like scenes from an anime! I can see it in slow-mo.
For me my biggest fuck ups during my studies were : breaking a fossil that is not only super rare, but also the example described by Louis Agassiz in the XIXth century (and gluing it back because thank God I had superglue in my bag that day), stealing a key to a room because we needed to take pics of objects seen through the microscope and the guy who usually gave the key wasn't there. As I knew where he kept it and we only needed it for 4 minutes, I took it, and my buddy broke an expansive piece of equipment. Not me technically but I was the enabler here.
At real work I don't have enough experience to really fuck shit up, but I once jokingly wrote "Acid trip" as the title of some 4 yo's paintings, thinking my supervisor would get a chuckle and change it. But she trusted me, never checked what I had written, and the exhibition went like this. Fortunately everyone thought it was funny.

Missed my project delivery date by 1.5 years.

My best fuck up was probably when I put the chicken in the deep fryer and set it to both the wrong temperature and the wrong timer. My only option to save it was to leave it in there even longer and hope to God I pulled it out at the right time without burning anything. And guess what, it came out perfectly! :D

Well I just missed the first "up" in this title and I am at work so I guess that counts

Well I also once had a big fuck at work but that's a whole different story

Mia you got me intrigued now

Nothing says erotic like having sex in a psychiatry at night lol