Sometimes I'll enter complete fucking fantasy land in everyday life out of nowhere. It's sort of like a running movie on literally anything going in my head. In class, at home, etc. etc. The other day in philosophy class I pretended my gum wrapper was some sort of secret military aircraft dropping bombs on a terrorist compound. This'll even happen when I'm staring at a girl too sometimes, and i'll just imagine grabbing dat ass, or what it'd be like to get head from her, etc.
I've actually had the above happen in mid conversation with a girl, to the point where when i finally snapped out of it i stupidly nodded my head and went "doh" to acknowledge i was listening to her.