Daniels, 58, is known for his critically acclaimed roles in "The Squid and the Whale" and "The Purple Rose of Cairo."
He stars as a cable news anchor in the HBO series "The Newsroom," which returns for its second season on July 14.
Daniels said he's always surprised by the people who approach him about his "Dumb" role.
"To have what you would think (would) be very smart, intelligent people come up to you (and say), 'Can I talk to you for a second? Don't tell anybody but 'Dumb and Dumber' (is) unbelievable.' I get that a lot."