LGF, it's curious that you mention Ping and Pong and Budoing, as mine made the most extraordinary sound as it gave way.
It was a loud and low end "Twong" - I would imagine something like a Crossbow cord makes when it's let loose. It felt like the bike frame had been whacked with a rubber mallet. I was on my 1997 Titanium Kona King Kahuna with the ultra rare Stars 'n' Bars paint job. I remember thinking "Oh no, my beautiful bike frame has been twatted".
The piece of shrapnel must have gone flying off like a bullet, but thankfully it didn't hit me.... or the bike!
Pip.