After Eli left his Tropicana orange juice in the fridge for 2.5 years and shared the results, I decided to do my own experiment and left a box of ice cream in the freezer for 2.5 years...
Actually it happened much more organically. See when I first noticed awesome ice crystals forming in the container probably sometime last winter I thought I would wait for a nice cold day so I could go outside and photograph it with my smartphone microscope, as I had been doing ... a lot. Of course I procrastinated for about a year until today when I could not hope for a better ice-cream-sublimation-crystal-photography day (-8 degrees in Boston).
Sadly it was clear that the crazy ice crystals had partially melted at some point leaving stubs so blunt they didn't look like much under the microscope.
And now for the record, the sell by date was 4/2014, and this is what it looked like on the inside, definitely see some evidence of warmer times in the freezer, very sad.
It tasted just like chocolate ice cream, but the consistency was crazy interesting. Almost like eating a cool sponge. Presumably the holes were gaps left by the sublimating water content. Because it was so dry it also didn't feel particularly cold. There was the occasional sharp ice crystal though embedded in the former ice cream though which made it still more interesting.