Now I get that this is a total joke, but in all seriousness they could make a totally awesome game out of this concept. Something along the lines of Katamari Damacy I'm thinking. You would have to mow at least x amount of lawn to pass and you would have to do it in specific patterns. You could also do edging and trimming trees/bushes/etc. I can totally see it. If done right with the proper humor, it has potential for greatness.