I was just playing the Song of Storms from
The Legend of Zelda: Ocarina of Time on my guitar. Within a second, rain started pounding at my window.

It was so cool I just had to share it. I'd better not play the Song of Time, lest I go back in time three days.
I know this doesn't warrant much discussion, so I'll just turn this into a "had any cool coincidences happen to you?" thread.