At my old job, me and a colleague were tasked with designing a new backup system. It had integrations for database systems, remote file storage and other goodies.
Once we were done, we ran our tests, and sure enough. The files and folder from A were in fact present at B and properly encrypted. So we deployed it.
The next day, after the backup routine had run over night, I got to work and noone was able to log in. They were all puzzled.
I accessed a root account to find the issue. Apparantly, we had made a mistake!
All files on A were present at B... But they were no longer present at A.
We had issued 'move' instead of 'copy' on all the backups. So all of peoples files and even the shared drives have had everything moved to remote storage :D
We spent 4 hours getting everything back in place, starting with the files of the people who were in the office that day.
Boss took it pretty well at least, but not my proudest moment.

*Stay tuned for the story of how I accidentally leaked our Amazon Web Services API key on stack overflow*

/facepalm

Crappy day, entirely related to cars and trucks and other wheeled implements of doom and annoyance.

My car died this morning.
It has been slowly dying for weeks in a very unusual way (something electrical; we're not sure what), but today it finally gave up and just wouldn't start anymore.

We replaced the crap battery (it had been a crap freebie from my parents), which fixed the not-starting issue for now, but it still has lots of other problems. Fluid leaks, disintegrating paint, some lights suddenly or randomly not working, super long clutch distance, sporadic grinding sounds, shifter randomly not engaging, pieces literally falling off, bits of the interior breaking (like the driver's side door handle), the wiper sprayers bloody missing the windshield, etc., etc., etc. My poor, poor car. It was super cheap, and I've had it for a long time, so I'm not surprised, but. I love my car, so it makes me really sad. ☹

Anyway, we finally got the car starting again, and I drove to work about four hours late. I had worked super late the previous night (11:45pm), and had let my boss know already, so whatever.

As for the trip, I work ~40 minutes away, and with the poor quality of drivers here there's usually something dumb happening. Today... well. Today was one of the bad days.

Someone was in the fast lane doing 50mph. The usual speed of traffic is 80mph. They got annoyed whenever someone passed them. Minor, but worth including.

Later on, people slowed way down and gawked at... a port-a-potty. Seriously, a port-a-potty. It was on the shoulder where there had been some construction, so it's not surprising or anything. People seriously dropped from 80mph down to 20mph just to stare at this thing, and it wasn't even occupied or anything. It was just a port-a-potty! There was nothing else around! What could possibly be so interesting?!

There was also a random Penske (moving) truck doing 35mph on the freeway holding up traffic like 10 minutes later; no idea why. Traffic usually does ~70mph there. No blinkers or anything, it was just being slow and causing everyone to go around in a pretty traffic-heavy area.

The truck in front of me for ~40% of the trip kept waiting way too long to stop, and would then slam on the breaks. I almost hit him twice because of this, and I couldn't see around him, either. It was some giant pickup staying just in the wrong spot. I ended up driving partially in the shoulder so I could gauge when to stop by the car in front of him. He slammed on the breaks like twelve more times before he finally left. Jerk.

The same thing happened again like 85% of the way to work, but this time it was a different pickup, and there was a semi was behind me, which obviously couldn't stop very quickly. Fortunately for both of us, there was a gap in traffic to my right, so I slipped out of the way before getting squished. ><

Bloody hell.
Today has not been fun.

Nobody flipping me off or was doing their damnedest to prevent me from changing lanes today, though, so I suppose it could have been worse. Also I didn't die, so there's that.