Pretty much only when I'm out with mom. I take her out once a week to the park or some place similar. We generally have dinner before I take her home. I'm not much for restaurant food and she's a very lite eater so we usually split a burger or some such item. Mom always wants fries with it, so we have fries. Most of the time it works out well with a single order of fries. I make sure she has enough and I eat the rest.
Often I think they see me taking care of my mom and I think they give us extra fries when they split the meal. Then I end up eating too many fries. I have the will power not to order them, but when they are sitting in front if me, I can't help eating them.