You probably won't fit your Supersized Meals in here, but I thought it was worth a mention. It's the world's smallest microwave. About the size of a cooler, you can heat your lunch on the go!
From: http://www.youtube.com/watch?v=XnprSa9WbaA
The WaveBox is a Microwave lunchbox with a cooler built in - it can be powered anywhere you go, on AC or DC