Well delusions/hallucinations aka Psychosis as there have been said.
A few examples from mine experiences:
I have seen the whole world change, sandstorm everywhere outside, no matter where I looked, small monsters running around, purple lighting all over the sky.
Ghost ninjas jumpin down from the roof and when they hitted the floor, my whole flat fuckin shaked/jumped, as the same time im getting hammered down of ghost goats or what it was, and my couch jumping up and down dancing.
Been gassed, couldn't breath, all smelled like gas, while I was grabbed on my legs, I fall around, thinked I should die.
My gf all she said was being change by the psychosis, also her expression in her face. I almost stabbed her from the evil things she said to me (mind it was the psychosis), after it was gone she told me about the horrible night and she had tried all night while she cried of saying that all I heard was fake, and I should relax etc. + My windows was getting smashed and police light/sirenes was going on at the same time.
Seen people jumpin in my windows, and seen people trying to get in, and ended me switching from would kill em with a hammer and crying for them to don't hurt me. I ended going over to my neightboor askin if there was guys rob us.
Have seen 3 of myself making lines fighting over who should get most, while I was up in the wall, like a fly on the wall, then suddenly "waking" up on the floor making lines, discuss with the others of me (who wasn't there anymore) so I was really talking with myself, and I did dad in days.
And I could go on, 8(