If you have ever travelled in a car with a teenager, and become tired of listening to noisy and/or incredibly misogynist music, especially the song where the boy meets the girl in the club and, well, he doesn't want to be disrespectful...but he just has to say that her rear end is [...], then you will appreciate this method of radio sabotage.
This method works only if:
1) you are in the front seat and the teenager is in the back seat;
2) you have push-button radio;
3) the teenager has a friend (or a DS gaming system) with them, making them less vigilant about radio tampering; and
4) you want to switch seamlessly from the noisy rock/hip-hop station to an easy rock/light favourites station (you can't switch to classical music, or to CBC Radio 1, or to the Radio Netherlands Africa Report: it would be too noticeable).
Here's what you do, in 4 easy steps.
1) Wait for a commercial. While your teenager is busy chatting with their friend, etc., slowly reduce the radio volume, bit by bit.
2) When the volume gets down to a whisper, push the button for your favourite easy rock/light favourites station
3) very gradually increase the volume on the light station.
4) enjoy several miles of mildly pleasant music together (perhaps Michael Buble or the Black-Eyed Peas) until the teenager finally wises up and calls out "Hey! That's not my music!"