That was my initial thought; but it's not that.
All the players I use (VLC, PowerDVD, Media Player and Nero's thing [Showcase/Showtime or something like that) do it on occasion.
If I don't do anything the optical drive motor runs fast and noisy all the time until I do do something (like switching players), I've left it just to see what happens and it does not correct itself on of its own accord; it'd screw the drive after I while, I guess); it's not normal. Usually you can't hear the drive working (after all it's not doing much most of the time reading a VCD is not exactly taxing work).
It's only with this VCD; it's never done it with CDs or DVDs.
I'll have to make another VCD and see if it causes the optical drive to behave in the same way.