Hi Sarah,
The reason why the guy did that was because he was sooooo cheap. Funny thing is, when I told him the price would be a pizza, I meant for the two of us to go out for pizza, but after he pulled that crap, I never had much to do with him, and the next time he needed a lift, oh, for some odd reason, I was totally unavailble. He was very upset that I couldn't give him another ride, but I was just too busy.... and it felt great, lol.