The "Mysterious Thing" is a watermelon firing its laser. Some guy in the first "Lazer Collection" video eagerly anticipates eating a watermelon. He states: "Oh my God I can't wait to eat this watermelon. I just hope that MYSTERIOUS THING doesn't happen to me again." The watermelon fires its laser just as the guy is about to grab it. It is unknown how he survived the first time this happened, as indicated by his hope that it doesn't happen to him AGAIN.