Put all of your unmarked rolls of film in a bag which you swear you are going to go process, but which you forget about due to other rolls that need processing. The bag sits in the freezer (to help keep the film from fogging) where it grows a thick freezer-crust, which will eventually melt when the power goes out, then refreeze. After several years of this you will have a solid chunk of ice and unprocessed mystery film, which you can pass on to your children to remember you by.

It’s sort of like ethan’s idea . . .