At the end of class one day, a student was listening to his music at a particularly loud volume on his headphones. Some other students were trying to hear it as well, and one said, “If you open your mouth, it’ll be louder!”
Another student chimed in, “And if you put the earphones up your nose, it echoes!”
Later in the day, a student (who was apparently not feeling particularly bright) announced, “I have the brains of a mango!”
They felt no better about themselves when it was pointed out that mangoes are actually a fruit.