Dawson's Creek - Season 6 Episode 15
Castaways

After agreeing to pose as Paceys sister at a business party, Joey demands to be taken home. When Pacey makes a quick stop at a local K-Mart they are accidentally locked inside the store. Theyre forced to spend the night there and talk about their friendship and relationship, both past and future. After the night is over they are both left to ponder what the future has in store for them.