"Reasons to be miserable... Marvin's his name."
I present to you Marvin the paranoid android from Hitchhiker's Guide to the Galaxy.
I made him entirely out of EVA foam (except for the head which is a 20 inch acrylic globe). Since I have to be on my knees for this costume, I have construction worker kneepads which allow me to walk around on my knees for long periods of time.
I have progress shots and will be posting pictures from DragonCon on my Rebel Among The Stars page.