Teleporter, motion-detection compression algorithm, editing shenanigan? You decide!
In this video, posted to gfycat, a man suddenly pops into view from behind the short square sign near the top of the image, just left of the white truck. [via Reddit]
Spoiler: cue the video to 9:40, watch the spot on the curb between the manhole cover and the round sign, and you'll see a shadow moving along the curb toward the point where the man is seen moments later.