Rene Auberjonois is the Chef in Disney's "The Little Mermaid." I still laugh about that one.
And then we have Jeffrey Combs voicing Ratchet on Transformers: Prime. Sometimes Weyoun goes up into the Ratchet tone of voice and I giggle every time. Some of Ratchet's funniest lines are over here on Youtube. http://www.youtube.com/watch?v=10TUh0wJkxw