WHAT!!!! THE FUNNIEST EPIDEMIC EVER!

On December 16, 1997, more than 635 Japanese children were admitted to hospitals with convulsive epileptic seizures. It was determined that the seizures were caused by watching an episode of Pokémon, "Dennō Senshi Porygon," (most commonly translated "Electric Soldier Porygon", season 1, episode 38); as a result, this episode has not been aired since. In this particular episode, there were bright explosions with rapidly-alternating blue and red color patterns.^[21] It was determined in subsequent research that these strobing light effects cause some individuals to have epileptic seizures, even if the person had no previous history of epilepsy. As a consequence, many publishers (including Nintendo) added warning labels to their video game products (or made pre-existing labels more prominent), warning that exposure to video games may trigger seizures in individuals vulnerable to photosensitive epilepsy.
-http://en.wikipedia.org/wiki/Pok%C3%A9mon