I had a friend who was going through some tough times - she got laid off from her job and dumped by her boyfriend in the same month. Out of sympathy, I let her crash with me while she got back on her feet. She ended up staying six months. Not only did she not even offer anything toward rent (I wouldn't have accepted, but she needed to offer), but she never contributed any groceries, amenities, etc., either. She did some light cleaning and cooking - that was it.

She was also a freaking lawyer collecting nearly $2,500 in unemployment every month (basically, our max) while not applying for any more than two jobs for the full six months that she lived with me. The only reason she left is because she knew I was getting sick of her shit and some guy who was in love with her (but whom she had kept on a string for years) kept offering to move her in with him instead.

Not only did I feel like she was totally using me, but I also lost so much respect for her throughout the process. It was tough to watch her continue to collect unemployment while putting zero effort toward a job search (the two she did apply for arose from mutual friends making introductions).