Check out this star-filled, Funny or Die video starring Jack Black, John C. Reilly, and many more… (against) Prop 8: Here’s a glimpse of the credits: Conceived and Written (six weeks later than he shoulda) by-Marc Shaiman Directed and Staged by: Adam Shankman Produced by Adam Shankman, Marc Shaiman and Mike Farah Edited by Bradly…