Pottery Barn rule

The Pottery Barn rule means that if you break something that belongs to someone else, you have to pay for it. Just like if you go to a store and break something, you have to pay for it. This rule is named after a store called Pottery Barn because they have a lot of fragile things that can easily break if you're not careful. So, if you're at a friend's house and accidentally knock over a vase, you owe them money to fix or replace it. It's important to be careful with other people's belongings and to take responsibility if you accidentally break something.