Molly wants to celebrate getting a new job. She invites her best friend Christina over. By the next morning someone is dead and the other is getting arrested for murder. Now go forth and write.
Monica and Sally have been best friends for years. Their friendship hits a snag when both girls become interested in the same guy. They promise to not let this guy come between them and each secretly start dating the guy. Now go forth and write.
Sometimes a picture can give you an idea. I'll post pictures here along with an idea. Use together or separately.