I would love to see Tom Kenny in the booth doing the Bus Driver's lines. So much hilarious passion in it.
I've said the same thing about Charlie Adler (Ed Bighead, Bev Bighead, The Fatheads, the nose-picking boss, Gladys--"How DA
AAAAr-eeeeeee you!"). Actually, I
have seen footage of Adler in action. Imagine a 5′ 9″--I'd have sworn, like, six, six-two easy, but that's how larger-than-life he looks--guy who looks like a biker dude, in a cutoff vest, long hair and beard, there in the booth, doing a tiny little girl voice into the mic.
This is actually Adler's "Red Guy" character, a whole other show, but close your eyes a moment, if you will, and imagine it's the Bigheads having sex.

Yeah, maybe not the best idea. Geez, that girl puked all the way into the previous scene. Fetch a mop....