Pretty straight forward: I agreed to go on a camping trip with a group of friends but ended up having to work and let them know a few days before the trip. When they got back they asked me to pay for my share of food and other expenses. I asked if they had eaten it all or if there were left overs and they said they had. So I asked how it tasted and told them I shouldn't have to pay for food I didn't eat or a campsite I didn't camp at. I've always wondered if paying would have been the right thing to do. Was I in the wrong?