It’s true! 😲 Bart Simpson is canonically a telepath, and not just in Treehouse of Horror episodes! Here is the proof from a scene in The Simpsons S29E20 “Throw Grampa From the Dane” when he uses his telepathic powers to enter Lisa’s fantasy. And there’s more proof in The Simpsons S5E20 “The Boy Who Knew Too Much” when he reads Principal Skinner and Homer’s thoughts. See these examples below:

Here’s the full quote about Bart Simpson being a telepath:

Principal Skinner: (thinking) “I know you can read my thoughts, Bart. Just a little reminder. If I find out you cut class, your ass is mine. Yes, you heard me. I think words I would never say.”
Homer: (thinking) “I know you can read my thoughts, boy. Meow meow meow meow, meow meow meow meow, meow meow meow meow meow meow meow meow.”

(via: Geek Girls)