Obscure mplayer problems
Since a little while now, I used to have the problem of the music skipping in mplayer. I guessed bad audio or crappy I/O, but I never noticed any errors anywhere.
What was happening was that when I moved my laptop, bumped against the laptop or table it was standing on it would skip or rewind the music. Sometimes a little, sometimes a lot.
Now I have a Thinkpad X40 and it only happened with mplayer, no other audio/video player.
Since yesterday I finally realised the problem after confirming it was related to me bumping against the table/laptop.