Jimmi Simpson looks back at playing Lyle the Intern on Late Show with David Letterman

Recurring on It's Always Sunny in Philadelphia helped land Simpson the role of David Letterman's repugnant, d*ckish Lyle the Intern from 2008 through 2009. "It's something about my face," says Simpson in an interview for Letterman's YouTube channel. "My face just looks like I might be a d*ck. And I'm fine with this. It's kept me working in this industry." Simpson also reveals he's never interacted with Letterman as himself.