Best Christopher Guest Performance and Film

I think his best film was definitely For Your Consideration, but I think his best performance was This is Spinal Tap...I think he comes very close to stealing that film from its very talented cast.

A Mighty Wind

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Performance, This Is Spinal Tap.

Film, Best in Show. I like it even more than Tap--though I tend to call the latter a "better" movie because it invented a genre and was more influential.