In 1924, the US had “Radio Silence Day” where radio broadcasts would be kept quiet for 5 minutes every hour in order to listen for radio signals from space. They didn’t hear anything.
Quentin Tarantino dug up and used actual KHJ radio broadcasts from 1968 and 69, along with commercials, for the soundtrack to Once Upon a Time in Hollywood. He sifted through 17 hours of airchecks to find the tracks he wanted to put in the film.
The late king of Jordan was an avid Amateur Radio operator who regularly interacted with people around the world. Taking conversations from anyone who had the privilege of having his JY1 call sign respond he never allowed anyone to call him King on the net, and helped the hobby gain members.
In 2015, a radio DJ in Austria barricaded himself into his studio and played Wham’s ‘Last Christmas’ 24 times in a row. He did it as a protest for lack of holiday spirit, and only stopped after his 4-year-old daughter called in to complain.
In 2015, French radio revolted against the law which compelled them to air 40% French language music. Due to lack of popular new French music, Just 10 songs accounted for 74% of all French music aired on NRJ radio.
When Chicago radio station “The Loop” was replaced by a Christian music station. They signed off with Highway to Hell.
The BBC created a Radio Soap Opera during WWII specifically for the American market. It was propaganda designed to get the USA to end its neutrality. One of the aims of the show was to appeal to those with a ‘limited mentality’. It ended up being a popular radio show in the US.
A pair of Miami DJ’s prank called Fidel Castro in 2003. They pretended to be Venezuelan President Hugo Chavez to get Castro on the line, and had a brief chat before telling Castro he had been fooled. Castro responded with a brief verbal tirade. The radio station was later fined $4,000.
CNN has a tape recorded to broadcast as the end of the world is happening.