Didja catch Optimus Prime on Letterman the other night?

The biggest machine in Transformers: Revenge of the Fallen is not Devastator: It's the PR mechanism, as evidenced by the following clip from The Late Show With David Letterman, which you can view after the jump.

In this clip, Optimus Prime delivers Letterman's trademark "Top Ten" list: in this case, "Things that sound cool when spoken by a giant robot." We don't guarantee it's funny; we just bring you this stuff.

(Thanks to Collider.com for the heads-up.)

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