I'm Sorry

The main subject is a screenshot of a chat conversation where users discuss a song's lyrics about shooting up schools, with one user calling it a "good" song and another identifying the song as "Cumberland high I think." The scene then cuts to a grainy, black-and-white security camera view of a school cafeteria where two students are walking, and a large, grey, elongated object resembling a cucumber or a small fish is superimposed in the air between them.