I opened the launcher then closed a few times and I noticed something consistent- that sound. I had no idea what it was, so I researched a bit and from what I found, nobody has had the "bug" before. It sounded a bit like a villager laugh or a "hurr hurr" which is the sound villagers make, but it was a bit different... I just have no idea of what this is! It's not a virus, either... On top of all of that, it only worked on one computer. It didn't happen on any other environments or computers...

How to reproduce (Might not work. Again, I don't know the details on it.)

1. Open the minecraft launcher (NEW ONE!)
2. Wait for it to load
3. Then you might hear the sound

Thanks for reading this bug report!