I've had OEVs from MDMA... there's a point where your body becomes "saturated" and it's converted into MDA isn't there?
I started getting a little guy on a bike zooming around my vision anyway for a while once, and the other "trippy" sunglasses type effects, seeing a Heineken logo on a friend's shoe, flowers hanging in a festival porta-loo and general weirdness...
Might be some green rolexes around here at some point, not sure if i'm "that" tempted though, maybe if they aren't ridiculously expensive.
I believe the conversion rate within your body is between 5-10% depending on who you ask. So in theory you'd have consume a fair whack of MDMA to benefit from this conversion.