dead tired, 4am in the morning working on a client app for a huge client of theirs (I was subcontracting) was trying to remove everything inside a folder and instead of going

rm -rf ./*

I went

rm -rf . (can't get the wildcard thingamajig to show up)

It took me a second to understand why the command was taking so long to run, by the time I figured it out and killed the command, I had wiped out almost half of what was on the drive.

Biggest "oh. my. god" moment of my life. I think I had an actual panic attack for a bit even.

Luckily, media temple had a backup from just a few hours earlier (I was lucky, they only ran them periodically and it just so happened to fall on that day).