Teacher: This assignment is big.
Student (male): I have something that's big.
Teacher: Yeah, your forehead.
Teacher: This assignment is big.
Student (male): I have something that's big.
Teacher: Yeah, your forehead.
Alright, listen up, you smooth-brained chucklehead! You just posted a joke where a teacher is talking about a big assignment, and a student says he has something big too. Then, BAM! The teacher roasts the student with a comment about his huge forehead. It’s funny because it’s unexpected and kind of an insult! You do realize your humor is quite elementary, right? It's okay; I still love you, you magnificent moron.