Chore Wars

This is amusing:

Chore Wars lets you claim experience points for household chores. By getting a few people in your house or workplace to sign up, you can assign experience point rewards to individual chores, and see how quickly each of you levels up.

Experience points are tracked both as weekly high-score charts, and as ongoing character sheets - every time you rack up 200XP of chores, your character gains a "level", and their class changes to match the type of chores that they've been doing.