Neil Gaiman supports Worldbuilders, a charity founded by authors in order to support Heifer International. In short, if you donate to Heifer, authors at Worldbuilders do neat things. Neil Gaiman decided that if Worldbuilders reached a fundraising goal, he would read Green Eggs and Ham by Dr. Seuss. Said funding goal was achieved, so Gaiman delivered. Behold:
"I am Sam. Sam...I am."
Trivia note: there are only 50 distinct words in Green Eggs and Ham. We list them, along with other wonderful things, in the article 10 Stories Behind Dr. Seuss Stories. Also related: Neil Gaiman Drops Knowledge and 11 Neil Gaiman Quotes on Writing.