Not much. I made eye contact with Henry Winker (Happy Days) back in the late 90s. He smiled and that was that. I'm not a big celebrity fan.
Recently my son met Ryan Gosling while at work. I was very excited about that because people used to comment how he looked like him. So when he told me he assisted him, I told everyone I knew lol It was exciting and some had commented that he "finally met his twin" ..