My old roommate happens to be a sort of dream companion of mine, and recently we were talking about this (she reads my DJ here) and she mentioned that she had a dream with me in it. Apparently she and I were in Chicago's Millenium Park taking some sort of class when I suddenly began acting all mysterious like I knew some big secret about the world we were in. She asked me what it was and I said i couldn't tell her but asked her to look into my eyes. The dream then zoomed into one of my pupils and she saw this mix of brown and olive and realized she was dreaming. So yeah, I was my friend's vehicle to a lucid dream. Maybe I'm her dream guide :p
I wish i could be my OWN vehicle to lucid dreaming...
i have to say though, it wasn't a very exciting ld for her, right after she realized she was lucid she remembered she had to get up for class and went into a false awakening where she was getting ready.