We were doing a project for uni in which we had to make a game in Java, we were on my department the night before working the last bits, it was working perfectly, until two hours until we had to turn it in, when I ran the code on IntelliJ it worked but the .jar file I exported didn't work and I didn't know why... I had to carry the my desktop PC I was working on because my laptop was broken at the time and we didnt have another computer on hand with IntelliJ and shit, I could swear I could see my friends laughing...
Two hours later from presenting the project I realized someone changed the file of a name from spritebatch1.png to Spritebatch1.png...
Changed it back, worked in an instant...
They were all behind me and started laughing like the best joke in the world was told...

I almost killed them all, but laughed along them afterwards...

Not having one in your city, and the ones in the entire country being difficult to find.