We had a cat that would roll around on the floor if there was a green olive on it. Then she would chew on the celery leaves when I'd bring in the groceries. I thought maybe catnip and celery were similar? Another cat would eat mushrooms from casseroles. My DDhated mushrooms so she would feed them to him. He once knocked a Cheezit out of my hand so it would fall on the floor so he could have it. He also would eat animal crackers, but only the cat shaped ones! Too funny!