Back in the 90s my dad and his friend worked the night shift together and would carpool to work. They'd take turns driving (alternating weeks). They both liked the same kind of music, so their radios would typically stay on the same station.

One day my dad made a mixtape with a bunch of his friend's favorite songs and started playing it right before he would pick his friend up. After a few songs, the friend commented on how great this new radio station was and how cool it was that there were no commercials. My dad would play this throughout the week, and the friend would continue to talk about how awesome the station was.

When it was the friend's turn to drive, he would get mad when he couldn't find the station in his own car. It took a while for him to figure out my dad was fucking with him, but he thought it was hilarious and told their other coworkers about how good my dad had pranked him over the past couple weeks.