Note: The following story contains spoilers from "Abbott Elementary" Season 4, Episode 9. When "Abbott Elementary" creator Quinta Brunson mentioned the idea of a crossover episode with "It's Always Sunny in Philadelphia" -- fueled from a conversation with Rob McElhenney during Disney's upfronts -- showrunners Patrick Schumacker and Justin Halpern agreed it would be fun,

Lisa Kudrow revealed during an interview on “The Drew Barrymore Show” (via People) that she recently discovered a note the late Matthew Perry left for her inside the “Friends” cookie jar, which he gifted her after they wrapped filming the series finale in January 2004. Kudrow wouldn’t reveal what the letter said but mused: “Timing …

Quinta Brunson talks about the inspiration behind Abbott Elementary and It's Always Sunny in Philadelphia's crossover episode, what it was like to have Philadelphia Eagles players making an appearance on Abbott Elementary and her Sesame Street appearance.