英语笑话：为什么背一块大石头

Two men walk in the jungle. One has a gun on his back and the other one a big rock. The one with the rock asks the other man, “Why do you have a gun on your back?” 

The guy replies, “When a wild animal comes, I can defend myself. And what about you, why the rock?”

The guy with the rock smiles proudly, “When a wild animal comes, I can throw the rock away and run much faster!”