I don't eat yogurt, so my cats have never even seen it. They seem to show general interest in kitchen activity, because that is where I prepare their food, even if it's not their mealtime. Once they realize that I'm preparing my weird food, they lose interest.
They try to climb on my lap when I am eating salmon or pepperoni pizza, even going so far as batting at it and trying to grab a piece. But, I just lift them off me and proceed to ignore them, NEVER EVER giving them even a taste of table food, and they just go away to play.