Watch A Manhole Cover Explode Into A Man’s Face
He seems to survive, so it's totally okay to laugh.
In this video a man tries to impress some kids by lighting a firecracker and dropping it down a manhole. But he didn't take into account that there might be gas built up down there - gas that would explode when the firecracker did. And so he takes a huge manhole cover DIRECTLY TO THE FUCKING FACE.
Stupidity: it's human.