With both Golden Globe and Emmy Awards under his belt for his work on The Big Bang Theory, Jim Parsons is no stranger to late night talk shows, but the charming actor stopped by The Late Show with David Letterman on May 12 to chat about the brand new territory he’s charting: the Broadway stage. Parsons is making his Rialto debut in Larry Kramer’s landmark play The Normal Heart, and he had plenty to share about the experience. The actor chatted about everything from allergy season’s nasty influence on Broadway audiences, how his mom made him the hard-working actor he is today (and why he’s “not intending on reproducing”), and how the entire Normal Heart cast shows their love for smokin’ co-star Ellen Barkin. Check out the clip below!