There Is Nothing to See Here
Certainly not exclusive footage of Monkeys On Steroids from Some Damn Cultural Center.
On an unrelated note, say you happened to have some pretty neat footage of an upcoming superhero movie — scenes of the superhero in costume, action scenes, things exploding, all sorts of exciting stuff. And say you were desperately trying to make this superhero movie different from its precedessor, which was reviled for being dull and action-less. Why on earth would you not use the good footage for your teaser trailer as opposed to footage of the superhero out of costume fishing and hitchhiking?! Hypothetically speaking, of course. Infinite thanks to David V. for the tip.