I've experienced some intense "tripping" on MDxx, as well as some fantastic OEVs and CEVs. By tripping (I hope that's the correct term), I mean internal head-trips; delusions.
The most amusing combinations of these hallucinogenic effects happened on the same night, after three known piperazine beans (the legendary UK Rockets), two high-quality white love hearts and a few crystals of MDMA. Tolerance was very low at this time. I was on a dance floor having a conversation with my friend who was next to me. After 30 seconds or so I emerged, asked my friend a question to continue the conversation, and he just looked baffled and said "what? I didn't say anything!". The second event was when sitting on a train, thinking I was holding an empty spoon and trying to eat from it. I emerged from it to my friend laughing and saying "what the fuck are you doing?".
This hasn't happened for a few months, since my tolerance has increased (and consumption of crystal MDMA diminished along with its availability), and it would only happen after a significant quantity was taken at once, and usually only after a final re-dose after the primary high has depleted somewhat.
The instance of talking to oneself in dreamy state has occurred to a few of my fellow men and women.