I've had many, but this is one of my favorite "OK, I'm getting fired for this" moments.

A new team in charge of source control and development standards came up with a 20 page work-instruction document for the new TFS source control structure.
The source control kingpin came from semi-large military contract company where taking a piss was probably outlined somewhere.

Maybe twice, I merged down from a release branch when I should have merged down from a dev branch, which "messed up" the flow of code that one team was working on.
Each time I was 'coached' and reminded on page 13, paragraph 5, sub-section C ... "When merging down from release, you must verify no other teams are working
on branches...blah blah blah..and if they have pending changes, use a shelfset and document the changes using Document A234-B..."

A fellow dev overheard the kingpin and the department manager in the breakroom saying if I messed up TFS one more time, I was gone.

Wasn't two days later I needed to merge up some new files to Main, and 'something' happened in TFS and a couple of files didn't get merged up. No errors, nothing.
Another team was waiting on me, so I simply added the files directly into Main. Unknown to me, the kingpin had a specific alert in TFS to notify him when someone added
files directly into Main, and I get a visit.

KP: "Did you add a couple of files directly into Main?"
Me:"Yes, I don't what happened, but the files never made it from my branch, to dev, to the review shelfset, and then to Main. I never got an error, but since
they were new files and adding a new feature, they never broke a build. Adding the files directly allowed the Web team to finish their project and deploy the
site this morning."
KP: "That is in direct violation of the standard. Didn't you read the documentation?"
Me: "Uh...well...um..yes, but that is an oddly specific case. I didn't think I hurt any.."
KP: "Ha ha...hurt? That's why we have standards. The document clearly states on page 18, paragraph 9, no files may ever be created in Main."
Me: "Really? I don't remember reading that."
<I navigate to the document, page 18, paragraph 9>
Me: "Um...no, it doesn't say that. The document only talks about merging process from a lower branch to Main."
KP: "Exactly. It is forbidden to create files directly in Main."
Me: "No, doesn't say that anywhere."
KP: "That is the spirit of the document. You violated the spirit of what we're trying to accomplish here."
Me: "You gotta be fracking kidding me."

KP grumbles something, goes back to his desk. Maybe a minute later he leaves the IS office, and the department manager leaves his office.

It was after 5:00PM, they never came back, so I headed home worried if I had a job in the morning.

I decided to come in a little early to snoop around, I knew where HR kept their terminated employee documents, and my badge wouldn't let me in the building.

Oh crap.

It was a shift change, so was able to walk in with the warehouse workers in another part of the building (many knew me, so nothing seemed that odd), and to my desk.

I tried to log into my computer...account locked. Oh crap..this was it. I'm done. I fill my computer backpack with as much personal items as I could, and started down the hallway when I meet one of our FS accountants.

L: "Hey, did your card let you in the building this morning? Mine didn't work. I had to walk around to the warehouse entrance and my computer account is locked. None of us can get into the system."

*whew!* is an understatement. Found out later the user account server crashed, which locked out everybody.

Never found out what kingpin and the dev manager left to talk about, but I at least still had a job.