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One of my point-and-shoots (my beloved and behated Ricoh R1) has the weirdly handy propriety that it loads its film backwards; first loading out the entire roll and then respooling it as you shoot (so basically starting from frame 36 and then counting backwards).

Not entirely uncommon with point-and-shoots but always a nice feature when they have it; it's meant to protect your film if you accidentally open the back (or rather more likely, if the camera suddenly dies on you in the field).

But a nice side-effect is that it allows you to easily shoot the same roll in two different camera's. Bored of your camera? Just unspool it, make sure the tip stays out, and pop it in the Ricoh; which will start at the end of the roll. As long as you keep track at what frame to stop shooting the rest is easy peasy.
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