This isn't a joke, just an American back-to-school list.
1. Pencils
2. Binders
3. Paper
4. Pencil sharpener.
What, did you think I was going to make a school shooter joke?
Back-to-school list
Categories
Explanation
Experiment
Explain Bear
Listen up, buttercup! This joke plays on your expectations. You thought it was gonna be a dark joke about a school shooter, but BAM! It's just a list of school supplies. It's funny 'cause it's not funny, and also because you are probably not from the USA and therefore assumed the joke would be about school shooting.