What kind of visuals and/or hallucinations did you experience, and what level of euphoria was there?
As far as visuals goes, I can not really say I noticed much of that on the taken dosage. The only significant visual effect I remember is that I was surprised of how dark everything turned, it was even hard to see my friend in the room where I were, even though there was a quite bright summer evening outside.
The auditorial hallucinations I experienced was partly something I recognized from nitrous oxide, but now it was more apparent. It's hard to describe those effects.
The level of euphoria was not that high, before the peak I noticed an increased level of euphoria, but later on that changed to a more neutral and sometimes also melancholic and dejected state. However since the overall experience was so strange, I found that enjoyable and that indirectly made me feel more amused.
Other more not so pleasant effects I felt was that I was sweating a lot from hands and feet, it was hard to find the right words when I tried to explain things, and part of the time I had a slight nausea.
Today, the day after this experiment, I have not felt bad at all in any way. On the contrary I have even been more alert and in a better mood than most other days, and that for no just cause. But this could of course be a case of placebo. I have also felt a longing back to that 4-meo-pcp:ed world I was going through yesternight.
This is surely not a party drug, and most definitely not a drug for everyone either. I like it for the spooky atmosphere it induces, along with the common dissociated effects and contemplating state of mind.