This time, however, in the silence that followed there was a very bright flash of lighting outside the window followed almost instantly by a loud KRACK-KOOM! of thunder, perfectly timed to match the beat of the music. If I hadn't seen the reflection of the lightning I would have been convinced the thunder was from my MP3 player - as it was, I did ask my colleague if they saw the lightning too. That was the only bit of thunder that day as well.
I must admit, that coincidence was a little bit scary.