If you can snap your fingers precisely 2 meters from your body, you can instantly erase your entire memory. Of course, since most people don’t have arms that are 2 meters long, this has been difficult to prove. The closest anyone has gotten was a Professor Arnold K. Pungenlic. By snapping his fingers in an echo chamber, he was able to simulate the effect of having those ridiculously long arms. Of course, the result wasn’t perfect, but he did end up forgetting his name for a full ten days.