"I say, Phil, I can do that." "Do what, Teddy?" "A cartwheel in the air like that fellow is doing in the picture on the billboard there." "Oh, pshaw! You only think you can. Besides, that's not a cartwheel; that's a double somersault. It's a real stunt, let me tell you. Why, I can do a cartwheel myself. But up in the air like that--well, I don't know. I guess not. I'd be willing to try i…