Build Your Own Optimus Prime Costume out of Cereal Boxes
Still don't have a costume for Halloween? Well, if your up for it you can build your own Optimus Prime costume out of cereal boxes by following this instructional video below that was put together by a very resourceful Transformers geek.
It took this guy 5 days and $20 dollars to build the costume, using lots of cardboard, cereal boxes, velcro, hot glue and superglue, among other things.