A guy buys a new car stereo. If you shout "rock" it will play rock music, if you shout "RnB" it will play RnB music and if you shout "reggae" it will play "reggae".
One day, the guy was driving along with his new car stereo and two kids ran out in front of him. "Fucking kids", the guy shouted - and Michael Jackson started playing on the stereo!