'They were planning on suing the professor': Vandals get served instant justice when they meet an engineering professor's indestructible mailbox

This first-class internet tale is a literary masterpiece, complete with classic themes of right and wrong, unstoppable forces, agents of chaos, and a savvy professor teaching his students the rewards of critical thinking—complete with the bad guys getting their just deserts in the end. It has echoes of some of the greatest literary classics and is one of those stories, an almost urban legend, that you hear a version of every now and again passed as something that happened to a friend of a friend of a friend in conversation. Heck, I'm surprised there hasn't been a cinematic adaptation yet starring Tom Hanks as the wily professor… "Tom Hanks is Professor Mailbox in "Professor Mailbox," coming to theaters near you this fall."

Redditor u/AQuietBorderline originally this story to Reddit's r/ProRevenge subreddit, telling about a group of college engineering students who were tasked with creating a mailbox that couldn't possibly be destroyed by anything short of an explosive blast.