Just saw Demetri Martin's special, Person (2007). 
It's not for me. 
I don't like this "folk-joke" telling with a guitar and an harmonica as a punchline. It's exactly like Steven Wright and I already didn't enjoy A Steven Wright Special.
I respect the writing, the funny ideas, puns and worlds on words, but it doesn't make me laugh, once perhaps the side of my lips twitched, that's about it for a smile. 
Too much poetry, when I want comedy. Nice poetry though...
"I wonder where my jokes goes... (insert guitar, harmonica) after they leave my head, into space..."

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I want intimate truth, not your goofy emotional thoughts.
That's cute, don't get me wrong, but I'm not watching comedy for cuteness.
So long Demetri.