Take a cardboard box and seal one end. Cut a hole on tops so head will fit through, cut holes on sides to fit arms through.
Paint box white and add red stripes and paint the words "Popcorn".
On top of box around hole, glue cotton balls to simulate popcorn. Add scalloped edge to top. Take a baseball hat and glue cottonballs all over it. Wear white sweat shirt and white pants.
Instant costume! this won my son first prize at a Halloween parade.
Thanks to Jana from NJ for this fun idea!!