I'm not sure whether this is ingenious or just sad. For just $9.59, you can get a complete Christmas dinner in a "HotCan," which heats itself.
When it’s time for your festive feast, simply remove the rubber cap, pierce the holes, open the insulated can and try not to drool on yourself as a totally safe exothermic reaction heats up your Christmas chow in about 12 minutes. We’ve heard of convenience food but this is ridiculous. Mmm…Turkey casserole with all the trimmings.
To be fair, the HotCans come in several varieties, and are marketed toward wilderness campers. And you don't have to wait until Christmas day to eat it. Link