Kiefer Sutherland was on Late Night with Jimmy Fallon on Friday and talked about 24 and, well, that whole head-butting thing (which has now been settled). He also did Fallon a favor by recording an outgoing message for him in his Jack Bauer persona (whole interview below - phone segment is near the end).

Not sure who I'd want on my answering machine. Maybe a character from The Simpsons, Jack Donaghy from 30 Rock, or Ben from Lost. I don't watch Idol, but having Simon on my phone could be funny. (Video also here.)