I would not only say no, I'd say HE!! no! espeically after hearing the lottery part.....forget that. I'm a generous person, but they aren't in NEED of it for a dire situation, so I'd say no. It's your car that will be damaged or broken if something goes wrong, and I doubt they would want to pay to have it fixed for you. Not to mention, if they got in a serious accident with it, and they are borrowing it, insurance sometimes won't cover it because it's not being driven by a registered driver, which could come back and bite you in the hiney.