Because he was in Superbad. Although I don't understand why THAT movie was so popular.
I got like halfway through YIR, book version. I just couldn't do it. Dear Lord in heaven. It was horrific. I wanted to cut my own fingers off by the time I was done with it for fear of ever going off my rocker and writing something as awful as that. The movie is completely out of the question, unless they destroyed the book.