I once was working freelance deals. I talked to a guy and the project he had sounded reasonable. As it, he wasn't claiming we were going to build a Facebook competitor. He had a good business opportunity with a solid opportunity for revenue. A 30 minute Skype and I agreed to start work at a certain rate.

He sent me a contract that stated I had to provide unlimited warranty on any software I wrote for 3 years after the date of the last payment. I kindly told him I was no longer interested. He told that was his 'standard contract' and had 'never looked at it anyways'. Six months later I was still getting emails from him about once a week asking me when I'd be able to begin work.