I really don't buy the whole thing with the radio. Just because it's classy and old school, doesn't mean that's Joker. Radio would seem silly.
TV makes more sense, because the Joker WANTS to be seen. He DOESN'T want to be in the shadows... or be the mysterious voice on the radio. He wants to show off his charming looks (at least to himself, he's charming). He thinks he's the greatest thing since sliced bread... god's gift to the earth. He doesn't think he's grotesque. He doesn't think he's odd because he looks different than everyone else.... He thinks he's BETTER than everyone BECAUSE he's so different. It makes him empowered.
He EMBRACES his appearance. He smears lipstick all over himself not to hide his scars, but to make them more noticeable. Deep down, he DOESN'T want superstar Brad Pitt looks. He has accepted his appearance, he loves it, and that's what makes him so scary. He's not ashamed by how he looks... He thinks it's a
quality. So therefore... wouldn't he want to be on TELEVISION, in order to show off how "great" he looks??
The thing I love about Heath Ledger playing the Joker, is that Heath Ledger is so damn good-looking in real life. His boyish-smile, his eyes... He's "dreamy" to many girls (the "10 things I hate about you" era)... and now he's playing someone who is GROTESQUE... but his character still EMBRACES his own looks, and he believes he's good looking - even though he no longer is. The fact that he has a "joker smile" in real life... but yet we won't see that smile in the movie because of his make up... I think that's even
more brilliant, because it shows that we're not getting Heath Ledger because he
smiles like the Joker and
looks like the Joker - We're getting Heath Ledger because he can literally
BECOME the Joker. It's not about appearance. It's about performance.. and I will stand by the theory that Ledger will BLOW US AWAY.
^^^ This is DREAM CASTING. It's perfect. Naysayers need to think about this stuff more.