I can't speak for anyone else, but on the off-chance I don't shoot the last frame on a roll of film I'm really excited about, I have a tendency to get impatient and just take a picture of the first thing that comes to mind. Sometimes, I get good things. Other times, I start to notice patterns.
Like the fact that I have a gazillion pictures of the fridge. It started off so clean and empty, and just gotten worse even since the most recent of these images... Maybe it's time to take everything down and start fresh. Or start using that last shot for something else.