"Earshot" - Buffy The Vampire Slayer
Buffy the Vampire Slayer was met with tricky waters when they aired "Earshot." The episode follows a student who planned to harm his classmates. The story ends up unearthing the fact that he meant to harm himself, but that still is a dangerous message to bring out into the world. The episode was scheduled to air just a week after the Columbine mass shooting in 1999. It was aired at a later date, but the air around dangerous acts in a school was already hot and viewers weren't happy with it.
"Patterns Of Force" - Star Trek
Star Trek always tried to slip in some relevant commentary of the time despite it being a total Sci-Fi flick. In the episode "Patterns of Force," the characters were dressed in Nazi uniforms. The reason was that they were being "brainwashed." Naturally, Germans didn't like this episode and banned it from airing in the country.