I had a cat as a kid who liked to eat bread. Specifically he would get on the table or counter and take one bite from each of the buns my Dad had bought for his lunches. He would get sooo mad.
My current cat had us fooled when we adopted her. The entire time we were transporting her from the shelter to home she never made a peep. A few days in and she was easily the most vocal cat I've ever met.