Help me with a picture to wear on my back while mopeding.

Here is what I wear now. It is a regular sized(8+1/2" x 11" i think) piece of paper printed out and laminated. Most people who see it give me the tumbs up. But, i want to switch it up so i was thinking of changing it to something like this. I am open to anything but that was my first idea.

TL;DR: Design something easily seen while moving, is black and white, and is funny.