What are some examples of consequences you give your LO when they act out/don't listen? How old are they? Working on this right now, trying to figure out what is age appropriate.

For example tonight LO was naughty at the library. Then in the car she was rude to her sister so we took away her opportunity to eat popcorn (a bucket we get filled that is a special treat). I'm just trying to figure out what's fair.