Transformers: Age of Extinction Clip Pits Mark Wahlberg Against Kelsey Grammer

In a new clip from Transformers: Age of Extinction that aired on The Late Show With David Letterman, Kelsey Grammer tries to put the fear of God into Mark Wahlberg, who seems...unimpressed.

You can check it out below.

Transformers: Age of Extinction opens on June 27.