Buried trailer

Just saw the trailer for Buried.


I have high hopes. Heard about it a few months ago in a list of top upcoming movies to be shown at Sundance (or at least i think it was Sundance. Maybe it was Cannes. I dunno). The promo tempted questions into my mind. What's the context? How have the screenwriters managed (or attempted to manage) a film that I presume is set entirely in such a small space? How exactly is this guy going to, erm, relieve himself? And can Ryan Reynolds act himself out of a box? We shall see.