its happned to me! i was just walking along the street in a dream. when these guess came up to me and said " hey! you need to hurry and go tell the boss in that building (points to building across the street) that you are dreaming!" they sounded all urgent like it was so important and stuff. It got me lucid though!

oh and i never went to tell the boss that i was dreaming. lol he is probably mad at me