Who’s dumb and who’s dumber? Jim Carrey crashed Jeff Daniels’ guest appearance on Conan Tuesday, bringing the Dumb and Dumber costars back together again. "I wanted to come out and say in front of the world, ‘You're in town and you don't call me,'" Carrey joked. "Not an email, nothing." He then teased Daniels about the press he has been doing for The Looming Tower, and discussed their on and off-screen chemistry. "It's like, when I saw him, there was a tingling in my groin," Carrey explained, "and that's the sign. That's when I know I'm with the right person."