I was debugging a DFP ad slot on a popular classifieds website and in order to spot the slot, I added a simple H1 with the words "FOOBOO".
For whatever reason I got distracted. Probably a meeting. Came back, started working on another task, committed, pushed, ran the build/deploy script, the whole sha-bang.
An hour or two later, I hear a few of the advertising people strike up a conversation going along the lines of "What's fooboo?", "Oh, it's an clothing label.", "Why are they on our site?!".
Felt like the longest hour while waiting for everything to build and deploy again.