Cats Feeding Themselves

This morning we woke up to find the cats had decided to feed themselves. This is nothing new, they've done it before, however this time i just can't figure out how they did it! Due to their past attempts, we have not one but TWO closures around the cabinet to keep it from opening. So this morning we found the food bag spilled all over the floor about 6 feet away from the cabinet.....but the cabinet was closed and still locked. I can only surmise that a burglar broke in the house and was so annoyed by the hungry cats following him around meowing that he grabbed the food (and being courteous, locked the cabinet back) and threw it down before running out the door with his ears covered and no loot. It's the only plausible explanation.