Test the Theory of Relativity

This mural is a Calvin and Hobbes comic, which is funny because Calvin wants to test the theory of relativity in a wagon (probably so he can have more time to play before doing his homework), when he would really need a spaceship travelling at or close to the speed of light (which is much faster than his wagon will go)! He still has partial success, since time did stop, according to Hobbes' watch.

Mural reads: Want to help me test the theory of relativity? Sure. The idea is that the faster we go, the slower time goes. Gotcha; it's 10:23. What time is it now? 10:34 Go faster. We're going pretty fast! What time is it? 10:25 Time still hasn't stopped. Has the time stopped now? No, just my heart. Well, it looks like Einstein's a fraud, wouldn't you say? No, he's right! Look, my watch isn't going at all anymore!!!