User blog comment:Mobo85/Jim Hill on the Future of Phineas and Ferb/@comment-96.28.65.79-20110814021820/@comment-24.141.17.10-20110816175831

Doof is a goofy guy. Watch dumb and dumber to see how well jim is at playing dumb people. I think he could play doof perfectly. However, for his voice, i'd stick to dans voice and lip syncing.