A Scanner Darkly, by Philip K. Dick
"When did you last see all the Planet of the Apes pictures? I saw most of them earlier this year, but then I got sick toward the last ones and had to split. It was a ham sandwich they vended me there at the drive-in. That really made me mad; I missed the last picture, where they reveal that all the famous people in history like Lincoln and Nero were secretly apes and running all human history from the start. That's why I want to go back now so bad."