What the heck was that? (Some Trailer I saw)

I went and saw Transformers yesterday. That movie was awesome, but that's not what this is about. Did anyone else see this trailer that started out looking like a buddy flick and than BOOM! Explosion? It was a really slow moving explosion, that made me think of Invader ZIM. But the trailer movie was unnamed. Does anyone know what it was called?

Cloverfield.

I saw that too. And when I saw the title, I was like

"It's probably about that Transformers trailer."

:rolleyes2

ahhh yes made by one J.J Abrams something about a monster comming to New York City lol well that wikipedia link pretty much says it all!