I tried some "daytripping" the other day with a sleeping mask and some ambient electronic music to muffle noises in order to see if that works - with a very moderate dose (I think 25 mg).  I observed some flying beings that struck me as "elves" and was thinking that the music was really quite nice (somaFM internet radio) - all of a sudden I heard a voice: "Oh, we love music" which really startled me and then I spent the next minutes watching them interact with the music rather dumbfounded. What was also amazing was that I got so caught up in their play, that I remained free of any interfering thought for the duration of the peak.  That was a wonderful experience. 

Another time with 50 mg but no breakthrough I encountered something very very strange, dark and to be honest, really frightening.  I have never had any negative experience on any psychedelic drug whatsoever, but for a few seconds, this entity scared the shit out of me.  What freaked me out was the vicious energy I felt from it and my inability to communicate with it to resolve the situation.  It took me a few minutes and all sorts of disassociation techniques to recover from that.

How much of that was real?  I don't know, could have been imagined in both instances, but it certainly felt very very real in both instances. I am still pondering whether the negative encounter was a manifestation of residual fear that I was confident of not having, or really something else.