That was Sam Peckinpah's version of Salad Days.
http://www.geocities.com/pythoninsanity/Season3Episode7.html
Julian: I say, Lionel, catch. (He throws the tennis ball to Lionel. It hits Lionel on the head. Lionel claps one hand to his forehead. He roars in pain as blood seeps through his fingers.)
Lionel: Oh gosh. (He tosses his racket out of frame and we hear a hideous scream. The camera pans to pick up a pretty girl in summer frock with the handle of the racket embedded in her stomach. Blood is pouring out down her dress.) (He tosses his racket out of frame and we hear a hideous scream. The camera pans to pick up a pretty girl in summer frock with the handle of the racket embedded in her stomach. Blood is pouring out down her dress.)
...
And from there it gets really bloody. If they did the sketch today, they would have used Tarantino instead of Peckinpah.