Peter Gallagher, who played Sandy Cohen on The O.C., recently reunited with Ben McKenzie, who played his adopted son Ryan Atwood, at his daughter singer Kathryn Gallagher's show! "Hey look who I ran into at @kathryng's show the other night! @ben_mckenzie! How great! I love both those kids!" he tweeted. Though the beloved Fox show -- which launched the careers of McKenzie, Adam Brody, Rachel Bilson and Mischa Barton -- lasted only four seasons, its mark on pop culture is pretty much undeniable. "Welcome to the O.C. b****!"