Nosey Neighbors and Horrible Husbands
I know it's a huge pain in the "you know what" when you've been working with your design client and all of a sudden you encounter a disruptive pest. I like to call these Nosey Neighbors and Horrible Husbands.
The absolute best way to prevent this annoying occurance is by addressing it during your Commitment Chat. That's exactly why I recomend that you have that talk in the first place. So that you can control your design process and avoid these common pitfalls that we old designers have had to endure.