I just spent hours diagnosing an issue that was caused by me stupidly mistyping a single digit of an IP in a firewall NAT rule.
Could have been solved in two seconds if I had just noticed it sooner.
Instead I rebooted servers, double checked configurations, ran port diagnostics, and even even check to make sure SELinux wasn't blocking me
That was hours wasted on something incredibly simple.
When was a time you did dumb stuff like this.