July 30, 2014 2:53 PM EDT

The 50 Shades of Grey trailer has been in heavy rotation this week as fans get their first peek at Dakota Johnson and Jamie Dornan in action as Anastasia Steele and Christian Grey, stars of EL James’s steamy boudoir bestseller turned sure-to-be blockbuster. So it wasn’t entirely surprising that Jimmy Fallon would ask The Tonight Show house band, The Roots, to watch the trailer. It never hurts to be up on current event in pop culture when the stars of the film will probably be stopping by the show during the eventual all-out 50 Shades press tour.

What The Roots didn’t know is that Fallon is an evil genius. They may have suspected as much after seeing him make acclaimed actor Morgan Freeman huff helium, but with this prank, he proved he belongs along side Lex Luthor, The Brain and Dr. Evil (or at least Dr. Doofenshmirtz) in the evil genius hall of fame. What did Fallon do? He secretly inserted a bleeding, screaming ghoul into the clip to scare the bejeezus out of them. Questlove did not approve.

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