[Image via WENN.]
This may be the funniest - and meanest - thing Jimmy Fallon has ever done.
He told house band The Roots that they were going to be filmed reacting to the Fifty Shades Of Grey trailer.
What they didn't know was… well, we'll just let you see for yourself!
Ch-ch-check out the video (above) to see some grown men just about pee their pants in fear!