Monica’s Jar
You will often see a consequence jar used for kids as either a punishment to correct a behavior or positive reinforcement to encourage a behavior. We see it on TV, and I can imagine some households use this method in real life. Some adults will also have a swear jar that they have to put money in every time they let a curse word slip.
Monica has a jar she has to put money in every time she yells in the kitchen. However, you might not know this because there isn’t a specific scene where this is officiated, but in season eight, when she yells at Phoebe and Tim, she mentions she won’t put a dollar in the jar. And just off to the side in the background, you can see a jar full of dollars with Monica’s name on it.