Think about a book or story you have read that made a strong impression on you. Select one of the secondary characters and imagine their point-of-view of what happened. Now write their story.
This is nothing new. John Gardner did it in Grendel (based on Beowulf) and Rhys's also voiced other characters in Wide Sargasso Sea (a before Jane Eyre interpretation). So give it a go. What would another character say about how things went and why? Give it a week's effort. See you next Tuesday.