I've done a lot of cool stuff, most of which I'm pretty pleased with, but near the top of my list is having been present for the launch of Apollo-8 in December 1968, and for several shuttle flights. I agree, 'sound' is a word that these experiences makes obsolete. You feel your sternum vibrating. The coins in your pocket rattle. The water in the lagoon in front of you ripples. It's like God has grabbed the sky in both fists and is tearing it in two -- that's what it 'sounds' like.