Ha! The one time I lost food to a bear was at Chimney pond in Baxter. It was hung from a tree in front of the shelter and the ranger had come by and said it looked safe. Not quite safe enough. The bear came along and was having a hard time getting to the bags, but finally made a desperate lunge and snagged one of bags. One swipe of his paw snapped a 1/4" nylon rope! Since this was right in front of the shelter, we had our flashlights trained on him and watched the whole show in awe - and a little fear.
The next year we went back with a longer, stronger rope. The problem bear was gone, but we did manage to have a moose come along and get tangled up in the rope as it lay on the ground in the morning as we ate breakfist. That was really exciting...