If I want to watch Tywin talk with anyone more, I'd personally go for the ol' lady Tyrell. Anyone who is happy to personally interrogate him over whether or not he sucks dick has more balls than anyone else in the kingdom as far as I'm concerned. They could be the geriatric buddy movie. Maybe more of a sitcom.
Beyond that: Bran & Hodor. But Tyrion and Bronn would easily better any of the other options, really.
EDIT: I would love to watch a sitcom version of Game of Thrones. It has all the hallmarks to cover a lot of laughs. Multiple awkward families with snippy elderly people, idiot youths, moody children, etc? Hell, The Lannisters could be a sitcom all on their own. It could be done in the style of Blackadder or something.

