Stuck finger
Humans are a curious bunch, and that’s how we made it out of the trees, discovered fire, and built whopping great metropolises all over the globe. Curiosity is the mother of invention, and that’s great when you’re working out why an apple fell on your head.
It’s not always a sensible thing to follow up every thought that pops into your head, though. For example, this guy thought “I wonder what would happen if I put my finger in this hole in the wall at Chipotle?” Then he discovered that it would mean waiting for the Fire Department. Not quite the great discovery of the century.