5D Mark III multiple exposures???

I'm thinking that this would be one use - showing the subject moving across the frame, like a skier doing a flip in the air or a dancer doing a jump.

Also in the old (film) days of wedding photography, I did a number of double exposures (ceremony inset in a photo of the church, bride & groom in a wine glass), that sort of thing. I may have to create some cutout filters for my lenses.