I'm unfortunate enough not to experience this. So no firsthand accounts from me. If you want an exceedingly detailed report on this phenomena, check this out.
i have taken a LOT of acid in my life.
i am convinced the flashback phenomena is a myth.
it has never happened to me in 20 years (started acid when i was 15, i'm now 36).
fuck im on it right now. it feels amazing. there is so much more to LSD then people give it credit for. The flashback thing I'm convinced is a myth. Although ive only been doing it for a half a year, i no the better qualities it has vs. shrooms.