Even Stan himself knows how good this cameo is in one interview, he remarked about director Marc Webb: "He probably accepted this task out of gratitude; because he knows my cameo in Spider-Man (Amazing Spider-Man, 2012) is going to bring in the audience". After the Lizard learns Spider-Man's identity, he arrives at Peter's school and a fight ensues, eventually breaking into the school's library where the librarian, Stan Lee, is listening to classical music and stamping books, completely oblivious to the chaos around him. With the camera following Stan around the library, it's clear this scene is devoted to the hilarity of this cameo and only Stan Lee could pull it off the way he does.
I have an addiction to achievements, a craving for new bands and a dream to become Captain America. I once finished second in a Mario Kart 7 tournament so I'm kind of a big deal.