what about this? do you recognize the actors in this new public service announcement? the cast of the 1960s tv series "the patty duke show" with a few extra decades on them. they reunited to help the social security administration promote its new online registration service, and patty duke reprised her role as identical cousins, the straight-laced kathy and the much-cooler patty. at least she was very cool in the '60s. wolf, this must bring you back a bit. can you sing the show's theme show? >> no, i watched a lot of shows in the '60s, but it's not among my favorites. >> i heard it on youtube. it's very catchy. >> let me hear some of it. >> don't ask me to sing it. >> don't ask me to sing it. >> it goes, me, kathy, da da da. i'm a youngin, so it's a little before my time, wolf. >> thank you. we're only minutes away from the top of the hour and cnn's new show, "john king, usa,"