Best debug ever?

Some years ago we had to do a web project as group. It was a cinema like website with backend and front-end.

So in the end we arrived at the presentation and while scrolling the code I found commented out some authentication controls 😅😆 (probably for debug reason lol)
Whatever, meanwhile, while I was talking with the professor two of my mates were whispering... Turns out they found what he mail service wasn't working. And what's best than fix it, push it to the Heroku server and restart all? XD
The professor noticed some little lag in a button and asked "what's happening?"
"oh, nothing we just restarted the server "