Multiple exposures are fun.

I love exposing film once, twice, and even three times. I have only done this on one singular camera by manually rewinding the film, and then advancing it once again to trigger the shutter button. One thing that I haven't gotten "down pat" is how to make sure that the 2nd or 3rd exposure is in the exact frame as the 1st exposure. There really is no way to know, unless you are completely OCD and can gauge the film winder with the film advancement knob. I always end up getting really abstract frames that overlap, that could technically be printed as one large panoramic photograph. When you get the film developed and scanned by another party, they often make a "crop" for the image, which is the standard 2/.3 ratio that can be later be enlarged. Typically you would have to scan the film yourself if you would like to have the complete panoramic-esque photo to work with. Be sure to NOT get your negatives cut!

It is rare if you can get the film with a perfect 2nd exposure right over the 1st.

I have a point and shoot Olympus Infinity II, which automatically winds in the film for you. I love that when the roll is done it winds it right back.

The magic of this camera is that it leaves the small tab of film out of the container. This allows you to safely remove the film from the camera without any exposures, and then load it into another camera. As you may know... rolling film back into its container is hard to gauge, and once it is all rolled in...that's it...unless you want to risk going into the dark and dissect and reassemble the roll.


My next venture for photography...
Take a full roll of film on the Olympus Infinity II...
Then reload into a camera that has a masking capability, such as a Fisheye, or Panorama. 
This way the masked areas will show case the original photo, while the unmasked area will showcase the secondly exposed photo.

A fellow photographer of mine, Traci McMillan seems to have got it down pat. Look at the amazing double exposed photos she created.

Cheers!