I believe the lyrics you're referring to are from the song "This is Halloween" from the movie "The Nightmare Before Christmas." The lyrics go as follows: "This is Halloween, this is Halloween, pumpkins scream in the dead of night." This song is a staple of the movie, providing the iconic soundtrack to the eerie and spooky atmosphere of Halloween Town. The song is sung by the residents of Halloween Town, including Jack Skellington, as they prepare for the coming of Halloween. It's a catchy tune that perfectly captures the essence of the Halloween season.