This strip is here mostly because it seems a lot like something Linus would do.
Also, while there might be an earlier example, this is definitely one of the first times Schulz uses a bent-over, upside-down, floating in mid-air character as a way of representing them tumbling through the air as they fall. This gets used most often when a character is shouting at another one or, of course, then Lucy pulls away the football as Charlie Brown tries to kick it.
