Once upon a time I worked on the Commissions system at a mobile telco... I haven't the foggiest what was going live that night but I made it clear to the people doing the deployment that I was going to be unavailable, as I was going to see Iron Maiden at Brixton Academy (which means, thanks to SongKick I can tell you it was 20th March 2002).
So having thoroughly enjoyed the gig, and many alcoholic beverages with mates, I'm off the last tube and waiting for the night bus home. And my phone rings. I don't recall any of the conversation, but something had gone wrong, and I was being asked if I could help them identify what!
My boss said he had two things to note... I was quite obviously hammered, and yet was giving the exact SQL commands for him to run with no problems whatsoever. And I was very loud, so half of south London probably heard what I was saying :)