Has anyone ever seen people where they shouldn't be?

When I was 9 I saw a Native American playing a flute on my uncle's private land. He didn't invite any flute players.

I think this was a glitch in time. Anyone else have similar experience of seeing people who shouldn't be there?

Why is this in the Aliens and UFO's section? In any case, I believe that a lot of ghost sightings may be attributed to "glitches" in the space-time continuum. I remember watching one special on A & E about ghosts, where some man was ascending a staircase, looked up and saw an "apparition" at the top. The funny thing was the "apparition" was staring back with a look of shock, surprise and curiosity.