16 December 1997 Pokemon Seizure Scene - Denno Senshi Porygon

"Dennō Senshi Porigon?, translated as "Cyber Soldier Porygon"

"The episode is infamous for certain repetitive visual effects which induced photosensitive epileptic seizures in a substantial number of Japanese viewers, an incident referred to as the "Pokémon Shock" (ポケモンショッ&#12​463; Pokemon Shokku?) by the Japanese press. 685 viewers were taken to hospitals; two people remained hospitalized for more than two weeks. Due to this, the episode has not been rebroadcast worldwide."


[link to en.wikipedia.org]