I read somewhere someplace that cats naturally have a sweet tooth, which is why it's so important to clean up antifreeze (because both dogs & cats love the sweet taste, and it's poisonous!).
I have one sweet-toothie... my little Dusty! She likes the weirdest stuff. Her favorite thing is Ritz crackers with peanut butter on them. She also begs (sits up with her front paws kneading at the air, meowing soulfully) for the milk leftover in the cereal bowl! She prefers the milky leftover from Frosted Flakes; who doesn't?
I know it's not good for her so she only gets it every now and then, and not much. But oh boy that whining and begging really tugs the heartstrings.
I have another cat who has an egg-fetish. You even remove the egg from the fridge, and he makes this sound like a dove. He knows you're going to cook it somehow and feed him bits.