When you're not confidant enough in your own code ... but you should be:

Me: "Why the hell is this duplicating data?!?!?!"

-time passes-

-figures it out-

Me: Wait that returns an error wouldn't that be ...

Yeah there was an error on the god damn screen in the status box I created telling me what was going wrong but I just ignored it... I was knee deep in code and my own UI was telling me what was wrong ;)