Not exactly revenge, but we got a dinger notice about a few bald spots in our lawn. The spots we get always fill themselves in once the summer temps go up enough so I didn’t worry about it. What I did do, because it was such a petty complaint, was to go to the HOA-maintained clubhouse and took pictures of its many bald spots….the kind that don’t fill themselves in (different grass, different lighting, etc). I sent the photos in an email telling them that I’d fix mine when they fix theirs (knowing full well that my grass would be all filled in within a month). All HOAs need to have a petty meter. Sigh.