Woops, I forgot to mention that I was playing it on my PS2.
And the funny thing is, to my recollection, it's never happened on the PS1 console..
I just discovered that it doesn't just happen in that part particular of the game, but it happens about 10 minutes after I leave the game running without pausing.
I left the PS on for about 2 hours without being in the house, then when I turned on the TV again, I could still hear the music, sound effects and characters talking, it just looked like an extremely bright, colourful bomb had hit it..
So this has never happened to anyone else? Hmm, maybe I should just stick to playing it on the PS1 if that's going to happen..