The Mezzanine.
It's an experimental novel with a quirky idea: a man goes up an escalator towards the mezzanine, where he works in an office. The novel is about the thoughts that occur to him during this brief period of time, but rather than the classical brief and passing thoughts in the stream of consciousness style, the tangents are fully developed with a writing so serious and focused on the most trivial matters, that it has an interesting comedic effect.