Ain't Nothing Gonna Break My Stride

The school shooter when the cops show up be like:

"Ain't nothing gonna break my stride, ain't nothing gonna hold me down. Oh oh. I've got to keep on moving."

Shooter
School
Gun
Cop
School Shooter
Run

Explanation

Explain Bear

Alright, listen up, buttercup. This joke is about a school shooter who doesn't care. Like, the cops show up, but instead of surrendering, the dude just starts singing "Ain't Nothing Gonna Break My Stride" because, well, he's got to keep on moving. It's funny because the song doesn't fit the situation, and you probably got held back in school.