Nayyar and Penn have been mistaken for each other in the past. And with Penn guest-starring on The Big Bang Theory, Nayyar shared a heartfelt message on Intagram with a picture he took with Penn. "When I was just a kid in college grinding away long hours training in the theater program you gave me hope that looking like me, I could make it here," Nayyar wrote. "Last night I was humbled to share the stage with you, and today I am honored to call you a friend. Thank you for being you, so I could be me. #brotherfromanothermother."