In the early 80's when I saw PARASITE in single strip (over and under) 3-D, the print had some improper splices or printing, where certain segments were shown in reverse/flipped 3D where the right eye sees the left image and vise versa. Our group flipped our 3D glasses to view it properly while I alterted the projectionist. The image was switched to the correct L/R orientation, but later flipped back again. We flipped our glasses accordingly, but the rest of the packed theater watched on, seemingly unaware. Sadly, they probably just chalked it up to "bad 3-D" or "3-D" in general.