I once had a dream where I was in a Gato-class submarine. It fit in a kiddie pool. Vietnam (and I remember it distinctly as being Vietnam, despite what I'm about to describe) was also in the kiddie pool, constructed as a sandy island, with no vegetation at all. The only occupant of Vietnam was a geisha wearing a clown nose. She was clearly searching the water for the submarine, and upon finding it, she said (or sang?), "I wish I knew you were only a memory."
I woke up at that point, confident of two things:
1) I'm quite happy not to remember most of my dreams.
2) I clearly never need to do LSD, as my mind is capable of coming up with enough crazy **** without chemicals aiding the process.