Discovering Gravity

Physics Teacher: "Isaac Newton was sitting under a tree when an apple fell on his head and he discovered gravity. Isn't that wonderful?"
Student: "Yes sir, if he had been sitting in class looking at books like us, he wouldn't have discovered anything."

Wave On

When the attendant asked the photon if it had any bags to check... It said.. Nah, I'm traveling light.

Bad Rainbow

Where do bad rainbows go?
Prism.
It's a light sentence and gives them time to reflect.