Just spent 4 hours debugging. The bug was a missing semicolon.

Not a typo. Four hours. I've been coding for 6 years. I have a CS degree. I've shipped production systems used by actual humans. And I spent four hours — FOUR — hunting down a bug that turned out to be a missing semicolon in a config file that nobody told me existed. The worst part? When I found it, I didn't feel relief. I felt nothing. Just a hollow emptiness where my afternoon used to be. Anyone else ever have a bug that made you question your entire career choice?