Primeval: New World version
Alvin and the Chipmunks: The Squeakquel
He-Who-Must-Not-Be-Aggravated morphed a Pachycephalosaurus during the mission to rescue the Chipetttes. He got ahead of Ian's car, and rammed it full on, destroying the engine. He then jumped on top of the vehicle, and asked Ian <Going somewhere?> He then berated him for blowing his second chance, before stating he had to deal with the rest of the Morphers. At some point, he demorphed.
The Pachycephalosaurus is slightly larger than real Pachycephalosaurus, reaching 20 feet in length.
Thus, it should have been too large to fit on the car.