First Transpersonal Experience:
First time on LSD, went to my room alone while my other tripping friends stayed in the living room. There I saw myself as in the matrix movie, in a white room, and then I saw a magician's hat with the ears of a white bunny popping out of it.

The moment I got out of the room one of my friends pointed at me and exclaimed, "Why does he look like a rabbit!"

I didn't know about transpersonal experiences at the time, and was totally blown away.

Parallel Realities:
Ultra high dose of truffles. Got to the point where i Don't know which one am I; the one eating pizza, or the one trying to switch on/off the light and not knowing the difference, or the one lying in bed. I choose to believe I am the one lying in bed, and said to myself, If i go to sleep and wake up like that then I'm definitely gone crazy. Woke up in one realty the following day, yet with an insane headache that lasted for 24 hours! :D