This is a classic joke! Here are a few options for what the science book could say to the math book:

* "You're so full of yourself!" (Playing on the idea of math being very precise and self-contained)

* "You're always trying to prove things!" (Math uses proofs to establish theorems)

* "I'm more practical, you're just theoretical!" (Science focuses on the real world, while math is more abstract)

Let me know if you'd like to hear more!