The parody movie "Meet the Spartans" (mostly parodying the movie 300) was on tonight, and I don't recommend it at all (it was just playing while I was on the computer)... but I was surprised (and laughed) at the Transformers Movie reference near the end.
The king Xerxes was running from the Spartan king and trips over a cube half buried in the dirt. He grabs it and refers to it as the "Transformers Cube", hops into a car with it, and promptly "transforms" into a robot (him inside it like an exosuit). As he advances on the Spartans he pulls out his extension cord and falls over dead.

Do not subject yourself to this movie just to see what I'm talking about, it is that bad... fortunately there is a clip of the scene on youtube (which is less than a minute long).