Gia recently told me this story.
A friend of hers was jogging through central park. He saw someone grab a woman's purse and run off so he gave chase. He started to catch up with the robber and began wondering what the hell he was going to do when he caught up with him. Concerned that the thief might be dangerous he slowed down so as just to keep up with him. He then decided to make contact.
"I hope you can run another 25 miles because I'm a marathon runner!" he shouted.
The crook looked back to see our man striding along easily... and dropped the bag.