Don't know if piggyback is the correct term, but what I'm wondering about is this. When you're at a shoot, and the client asks you to shoot something unrelated, and assumes it's all part of the price since you are already there shooting anyway. Case in point. I was at a reception the other day shooting for a few hours. The client comes to me and asks if I would photograph the food b/c the caterer wants some photographs of the food. Should I expect to be paid extra for this? Seems like the caterer should be paying me to photograph the food. If so, how should I go about letting them know that that would be extra?