These are two videos of South Korean a cappella group Maytree performing Windows and iPhone sound effects with nothing but their mouths. Most impressive. For reference, when I was in business school my classmates and I once passed an egg down the line using nothing but spoons in our mouths. I think it was supposed to be a team-building exercise, but apparently we didn’t build a very strong team because those rat bastards all stabbed me in the back at the end of the semester when it was peer evaluation time.
Thanks to my dad, who agrees that just like with duct tape and a little ingenuity, is there anything the human voice can’t do?