This is one of the videos he actually made of himself getting up on the table to conquer his fear of heights. I know it doesn’t sound like much, but don’t laugh, if you watch the video you’ll see that he really does find it difficult. He does it!
Here’s the link to the post where John Green talks about how he was dared to stand on a table in front of lots of people by a famous author, Justine Larbalestier (meanie). Justine said she’d give $5000 to the charity of his choice if he did it. Scroll down (almost to the bottom) to the post I am afraid of heights and then up to the one above On (sort of) conquering my fear of heights to see the video of John getting up on the table.