I live in a area that's prone to severe weather, so i'll run around and clean up peoples yards after a big storm. you'll be surprised at how much people will pay to have a couple of branches and sticks to clean up, After a good storm I could make about $500.
And to finish answering your question I did this so I could buy a new alternator for my car. It just kinda stuck with me and I like having a little extra cash in my pocket.