My favourite bug fix was actually IT based and it was the first time my Eastern European, critical of my skills, family not only praised me but claimed that I was smarter than them.

My grandfather had changed from a telecom to a VOIP device for his landline. For some reason after installation, he could hear the other person on the line but they couldn't hear him. Me and my mother were away during this time so they called in the other family IT guy. This guy is no joke, he's one of the top in his company and makes a sweet six figures and lives in a mansion.

So he started looking things up, googling forum, etc. Couldn't find anything. Started calling the tech support and tried to deduce what it was and their tech support had never heard of such a problem. He takes his lunch breaks to help out my gramps. Keeps escalating, escalating and nothing. His conclusion is that they need to send him a new VoIP stick and they're not giving it to him. At this point, he's so frustrated that he screams at my grandfather to go back to paying 60 bucks a month for landline and to stop bothering him.

At this time me and my mother return and they have concluded that they need a new stick. My mom is great at intimidating people into free stuff so she and I go over to do so. At this point everyone is convinced of the problem and even I don't think I could fix it. But I decide to check if that's the case because I don't want my gramps to get a new stick and it still doesn't work.

I go through the typical forum hunting and there's Nada on the problem. I look at the stick and all the lights seem to be working, no error lights. And I wonder maybe the problem is not the stick, because usually you can't do anything at all if the hardware is broken. So I start thinking, maybe my gramps accidentally muted his handset while talking or something dumb like that. That wasn't it.

Then I decided to see if the problem was recreated on the other handsets. I tried one out and my mom could hear me but I couldn't hear her. What?! That's different! It was the opposite with the other phone. I conclude that it's working and there's something up with the handsets. So I go and do a reset on all of the handsets to make sure.

Lo and behold, the problem is fixed. It took me 25 minutes to solve. That guy gave up after a week of trying. My mom who assumed my IT skills were on par with other kids and nothing special had finally seen me up against an opponent, and not any opponent, a six figure high ranking IT specialist. And I didn't even use any secret, complex software knowledge that wasn't accessible to her or any other normal user.

That's when she finally said that I was smarter than her, that I just used my common sense. She would've needed some kind of prompting, hint or direction to solve the issue but I did it without any.

It was a very satisfying bug to fix.