Well, LSD and mescaline (synthetic) and psilocin (synth) are not the most exotic and synthetic chemicals, but fun they are.
Wouldn't it be much fairier to newer, more exotic ones, if those three would be excluded?
From the list I still take three: LSD or synthetic mescaline and psilocin! They are IT
The most fun exotic psychedelic synthetical(s) are LSD and mescaline and psilocin. That does not mean, THOUGH that they the most fun in social occasions, or The most party-fun one. A more fun chemical meant for the party setting/in social context, it is 2cb. But the most fun, in general context, and from the list above, it's LSD and it's mescaline (synth)
I have a hard time while deciding which ONE . From the three, which is the most fun?
LSD is the most fun in some sense, but so is mescalinem, it is in the other sense, and yet there is also psilocin which is simply as fun as mescaline and LSD. All three are and would be, in general and in the most profound sense the insightful. Honestly, I should have included one tryptamine psilocin (or DMT) in The most fun ones. So, also psilocin...
LSD, mescaline and psilocin is The TRINITY, all what psychedelics are and could be.
All psychedelics contain something similar with each other, some characteristics of psychedelic, and mostly two phases. Within LSD it forms are easiest
Being always fueled with ecstatic feelings of glad insanity or cheerful attitude that puts laughing. Visual field is constantly in color-explosions and seeing a plastic breathing or living waves on everything is very typical to acid. Perceptions sensing changes in the perspectives all the time: the breathing of objects and walls puts seen and felt objects into the strange change the plastic order and in differing spatial relations all the time, again and again.
The most fun psychedelic experience is fueled with a psychedelia caused by the forces of acid or mescaline or psilocin to manipulate CNS, thus manifesting itself in all the appearing, and all the laughter! Effects are intense, profound and, momentarily ecstatic, espeailly in the beginning; later the psychedelia moves to introspective mode in all-meaningful as presented latter phase. Modes are ecstatic and introspective; not clearly discete, discernible, but simply foundable there.
Visuals of fractals and pictures everywhere are also usually present. And non-speakable objects often speak mysteriously, even audibly talk. Whole Universe appears as using understandable "language" or set pictoriarial forms. Much of the whole world seems to have a deeply spiritual meaning revealed by psychedelic experimenting and all those beatiful artistic forms are are flashing all over the WORLD right there right now. Psychedelia could appear through the whole universe and world all over, manifesting itself in the cheerful joyous welbeing of experimenting person and in the feelings and consciousness of the same person, having characteristic of ultimately positive energy and effects.
Answer depends on what FUN means to everybody. Mentioned effects appear mostly while I'm experimenting with the most FUN psychedelic of mine: LSD, mescaline and psilocin