I haven't myself, but why would you want to? Believe me, when your tummy is full of olive oil and lemon juice the only thing you want to do is lie down and go to sleep! :)
most of the flush recipes day it's important to lie down immediately afterwards, one from a while back says to walk all night.
If you want to be a pioneer, go for a daytime flush, keep walking all the time - which would, I imagine, put even more pressure on the liver at least - and let us know how it goes! If you get stones then that will be good info to add to our database. You may want to make the dosage rather low - 1/2 OO (Olive-Oil) to 1 cup juice so you can do things the rest of the day without heartburn.
This is not a completely exact science, and even if you get no stones you will have flushed old fat-laden bile, so even a "failed" attempt is really a success. :)