Celebrity·Posted on Jun 11, 2014Here's How Jeff Daniels Mentally Transformed Into Harry Dunne For "Dumb And Dumber"It's quite simple, actually.by Emily HennenBuzzFeed StaffLinkFacebookPinterestTwitterMail Tap to play GIF Tap to play GIF Tap to play GIF Tap to play GIF Tap to play GIF Tap to play GIF Tap to play GIF Tap to play GIF Tap to play GIF Tap to play GIF Tap to play GIF Tap to play GIF Tap to play GIF Tap to play GIF Tap to play GIF Tap to play GIF Ahhhhh, that explains it. Tap to play GIF Tap to play GIF Tap to play GIF Tap to play GIF Watch the interview here! View this video on YouTube Jimmy Fallon / youtube.com