In an infamous 1961 episode of The Bullwinkle Show, the Bullwinkle puppet encouraged viewers to pull the knobs off their TVs. Parents weren't too happy. From the Lost Media Archive:
It was reported that around 20,000 young children complied to this, causing NBC to receive a ton of letters from angry parents. The next week, Bullwinkle told the audience to glue their knobs back onto the TV and the puppet got pulled from the show shortly afterwards.