In the movie, a young girl named Samara Morgan, who has supernatural powers, haunts a cursed videotape. When anyone watches the video, they receive a phone call and are told they will die in seven days.
The scene you're remembering is when the character Rachel Keller, played by Naomi Watts, visits Samara's childhood home. On the roof, she finds Samara's well-preserved body and has a horrifying encounter where Samara tells Rachel to jump. Rachel then says, "After you," referencing the classic line from the 1997 film "The Game," which starred Michael Douglas.
Let me know if you have any other movie mysteries!