It's good to share duties with your roommates.
Carrie is cooking some food to bring to a party that evening.
Carrie wants to get to her party on time.
Carrie asks her roommates if they can clean up for her tonight, and she will return the favor later, so that she can leave on time.
Carrie leaves all her mess and dirty dishes in the kitchen, so she can leave early.
Carrie's roommates are happy to help, and she helps them out later in the week.
Carrie's roommates have to clean up her mess and consider kicking her out.