"In the beginning of The Silence of the Lambs (1991), the text "How do you like your blue eyed boy" and "1-2-3-4-5" appears on a blackboard, which is from the 1920 poem Buffalo Bill's by E. E. Cummings, along with agents working the Buffalo Bill case.
It's not clear exactly why the poem would appear in this scene though, because the nickname "Buffalo Bill" was given to the serial killer in the film by law enforcement, rather than the killer himself. So, it may be more of an Easter egg than an actual plot point or foreshadowing, because there's not a connection to the poem that would help the agents find the killer. Unless, of course, whoever wrote it was mistaken or just horsing around."