On a camping trip with a large group of people, we had a cooler loaded with nothing but breakfast fixins. It turns out someone forgot to close the cooler all the way before bed, and we awoke to find ALL of the food eaten or scattered around the campsite. Raccoon footprints all over the place. Imagine waking up looking forward to a huge camp breakfast and seeing that carnage. We sent out a shopping party to the nearest market (40 mi. away) to replace the goods. Late breakfast is better than no breakfast IMHO. We stacked logs on the coolers for the rest of the trip. We also never saw the offending 'coons, even when we were up late. Stupid critters!
I've also had run-ins with chipmunks. We stopped to fish for some lunch while backpacking, and had set our packs maybe 20 feet away while we set our lines in the water. I heard some crinkling and rustling coming from where we had the packs, but I didn't see anything. I figured it was just the wind or the contents settling in the bags. The sound continued so I went to check it out. I opened the top flap of my bag, and lo-and-behold, there were two little chipmunks attacking my bag of trail mix! They froze for a second with shocked looks on their faces then bolted out of the pack. I fell backward because it all happened so fast I didn't really have time to process what was going on. I closed-up my bag and returned to fishing. Not 2 minutes later, I hear the noise again. This time I see my buddy's bag rustling and moving from within, so I threw a little rock at the pack, and the little buggers bolted out of his bag. We decided to move on before they did too much damage to our food supply.