Original air date: December 16, 1997
Main offense: May cause seizures
Status: Removed from rotation

In 1997, things got out of hand when an episode of Pokemon, titled “Electric Soldier Porygon,” caused more than 600 people to go to the hospital when it aired in Japan. The problem happened during a part of the episode when red and blue lights suddenly started flashing at a high rate after an onscreen explosion. 

Viewers complained of headaches, dizziness, and blurred vision immediately after, with a few people admitted to the hospital with seizures. The episode was pulled from the rotation in Japan and has never aired since in any country. In the end, anime studios throughout Japan changed their style to ensure that the quick flashing lights that made Eastern animation so popular were toned down to avoid further incidents.