I think there was helium in that balloon, so he inhaled helium from the balloon as helium lowers the pitch of the voice, so after inhaling helium he become able to create that sound.
He didn't use helium, he used his real voice, how do I know? It's because it's very hard to control the pitch when you actually use helium and he only inhaled it for like half a second. Also it was an April fool's joke
@@Dark_Matt3rK1tt3n idk what my point was I honestly forgot about my comment so I didn't know if it was true or not when I was looking into it more. I now know that the person did hit the high notes perfectly I just didn't know 9 hours ago so therefore I don't really have a point making my comment pretty much irrelevant.
This guy was actually not using the balloon, but instead, he was pranking everyone and that was his actual voice, he's really good at that so he can make a high voice. Hope this helps! ❤
