I find it really interesting to hear that this happened to you. Same thing happened to me and to say the least I was mildly surprised as I had no idea that this was even possible!
I was preparing for the Liver Flush and it was on the 2nd day of drinking apple juice and apple cider vinegar that this happened.
Prior to this I had been drinking lemon tea every morning for the last few months and I had been taking 'stone-crusher' for 3 weeks.
As I didn't have time that week for a colonic (as recommended in A. Moritz book) I gave myself an enema with diluted water/ apple cider vinegar and about 50 large chick-pea shaped stones came out. I was absolutely gob-smacked!
Afterwards I felt about 5 years younger and had an instant burst of energy and positivity. I felt amazing.
I've since done 2 'actual' flushes that haven't proved successful and I'm now looking for a way to tap into that 'spontaneous' release of stones. Any ideas? :)