I like to think mine have been pretty benign

Believing the my apartment/I was full of the presence of an evil dark spirit from my past lives.

Believing my mission in this life was to conquer this spirit and free myself and family.

Believing I did this while meditating...(still no clear answer on whether or not that was psychosis)

Being afraid to go to sleep because I thought my soul would be taken or "transferred"

Believing that might have already happened and I wasn't actually me etc (this got confusing)

Holding rocks while I slept in order to "ground me"

Believing I had to satisfy all karmic debts ASAP

Believing master spirits were teaching me through my dreams.

Etc etc etc.

See nothing very "dangerous" or even obvious but I'm glad it crashed when it did without getting more out of hand. Lots of it was very nice but parts of it were terrifying.