Giant Robot Post-It Show

I just realized that I didn't share the Post-It replica I made for the Giant Robot Post-It Show, so here it is!

The original (left) I found in the trunk of my car. Where did it come from? Is it a clue? What does it mean? I didn't recognize the handwriting. I had to replicate it. Mine (right) is embroidery floss on a painted cotton swatch.