What Whedon Role Would Gregg & Fillion Reject?

It can be said without argument that both Clark Gregg and Nathan Fillion owe a measure of their respective popularity and successes to Joss Whedon for casting them in his various projects, including Firefly, Serenity, Dr. Horrible's Sing-Along Blog, Agents of S.H.I.E.L.D., The Avengers -- and now Much Ado About Nothing. But is there any role that they would turn down if Whedon asked them to play it? Enjoy their responses in this amusing clip from the Much Ado About Nothing DVD bonus features...

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On Blu-ray, DVD and digital download Tuesday, Joss Whedon's Much Ado About Nothing is a contemporary spin on Shakespeare's classic comedy about sparring lovers, offering a sensual, tragic and occasionally absurd view of the intricate game of love. The film also stars many of Whedon's favorite actors from some of his fave projects including Amy Acker, Alexis Denisof, Reed Diamond and Fran Kranz.