Does anybody remember the movie "Drowning Mona?" It starred Jamie Lee Curtis, Bette Midler and Danny DeVito. The IMDB write-up for it is here.
In this movie, there's a minor story line about a dog getting run over by a lawnmower. When the movie was released, its web site had a Flash game on it where the objective was to run over the dog with the lawnmower. When you did, the dog yelped, spun around and blood flew all over the place. While driving the lawnmower, you had to avoid obstacles and make sure that you didn't run out of gas. It's funnier than it sounds.
When the movie came out of the theatres (which didn't take long, by the way), they pulled the web site and the game. I looked for it for years and finally found it. I squirreled it away here.