I know this breed always has that expression, but it sure looks like he's saying:

"OK JOKE'S OVER...GET THIS D@#N THING OFF ME!"

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car