Mumford & Sons' folk music is rather serious, but the men who make it aren't. These fellas know how to take a joke and can laugh at themselves!

That's clearly evident in the video for 'Hopeless Wanderer' from 'Babel.'

The video starts with the band playing their instruments, but their faces are blocked by the sun.  Once they are revealed, it's quite a shocker!

Jason Sudeikis, Ed Helms, Jason Bateman and Will Forte are playing as stand-ins for the actual members of Mumford & Sons.

It's quite comical!