Never Lend Anyone Your Mp3 Player

My friend was going on a train journey and asked to use my mp4 player as his ipod was broken... (i told him never buy Apple)
So I gave it to him to use and he was was thankful but he had changed my playlist (one thing that annoys the hell out of me)
The story goes a bit like this...
I have a set playlist that spans musical history, with songs grouped by genre and all the tracks have a faster tempo as you go through the list...
Starting with some relaxing classical to some classic/pop, then a hint of rock and finally some energetic remix tracks for when I'm walking to uni
But my playlist is ruined and gone so I have to remake the playlist again...
So never lend your mp3,mp4 or ipod to anyone...
Thanks for reading