Chock Full O' Whatever

So B. is taking a community ed Saturday morning theater class with a superheroes theme. The kids make up a story involving superheroes real and imagined (B. is the ghost of Will Clark, a guise inspired by his fanatical love of baseball mixed with a villain from a Scooby Do episode). Usually I would take the hour and run, but I happened to be in the hall reading while class was on. The instructor started asking the kids about superhero catch phrases a la "up up and away" or "here I come to save the day." B., always one to make a contribution (or three) says "I know the Blues Brothers' catch phrase. ... We're on a mission from God."