Fiction by B.J. Novak.
Normally I don't really care for short story collections. This is because I get all interested in the story, and then BAM! it ends. This is annoying.
And this short story collection did do that. But the stories were (mostly) good enough that I didn't mind the BAM! so much. Although I did wish some of them were longer. There is --ahem-- some bad language, but there was seriously funny stuff here.
Note: Get the audiobook. The performances really enhanced the writing.