Regis Philbin and Jimmy Fallon performed a duet of "Just You. Just Me" on Fallon's "Late Night" show. Philbin has released an album with his wife Joy who is his usual singing companion but Fallon was quite the part, wearing a Joy-style wig, just to fit in.
Although Fallon actually did show some singing talent he was caught up in the comedy of the situation slipping a couple of jabs at Philbin. Singing "It's not that you're attractive" Fallon added "Seriously, you're not that attractive." To which Philbin agreed.
I've a feeling however that the song Fallon wanted Philbin wanted him to sing would have been funnier. Fallon said "It's called 'My Weenie'" to which Philbin responded "Regis said 'No'.