Popcorn. My cat LOVES popcorn. Unfortunately for her we don't get it very often and when we do we don't eat it very often, but when we do...wow. She's all over that stuff. She'll sit there and beg for you to give her a piece or two, and then when you do that she'll want more, and more. She won't stop, not even throwing her out of the room will slow down her unending desire for more popcorn.
Besides that she has a very peculiar relationship with Cheetos. She'll want some, and when you give it to her she'll sniff it, nibble it for a little bit, and then....ignore. Doesn't like it. However, much to my chagrin she'll be back again thirty seconds later, wanting more. The cycle will continue until you're either out of Cheetos, or you kick her out. Apparently, having to go back in the room is too much work to annoy us about Cheetos.