“That minuscule fraction of time it takes your brain to realize that you’ve just made a GIGANTIC mistake and reconcile the fact that it is too late.”
Like this one:
By the time I had this compiled and saved, the error had been corrected… but they were 0.67 ohnoseconds too slow.
Playing in the World Game 
The tragedy of depending on spellcheck!
I was taught that most mistakes that get through are in the very beginning and very end of an article. The one that haunts me was a story with a headline about pubic accounting. As I recall, another employee won $35 for suggesting that the word “pubic” be struck from the applicable spellcheck. It’s easy enough to skip if one is really using it, after all.