Astral Projection - People Can Fly
"When you dream there are no rules. People can fly, anything can happen. Sometimes there's a moment as you are awaking, when you become aware of the real world around you. But you are still dreaming. You may think you can fly, but you'd better not try. People can fly." (From 'Kalifornia' (1993), starring David Duchovny.)
Actually I saw the movie after I first heard the sample, so I was pretty stunned when I realized where it came from. One of the first samples I heard in a psy tune, and still the best IMO.
Check out this site for more samples used in psy tunes.