Stop Procrastinating and Write

Start time is a little later than normal this week from usual this week due to my Kafkaesque life.
Our goal for these Meetups is to write and talk about your work. We always have two 20-25 Minute writing sprints where you work on whatever you'd like. Sometimes we sneak in a third. In between, we discuss our writing and then writing in general.
The past few meetings I've tried to structure it as follows:
1. Very Short Introduction
2. 1st Sprint
3. Discuss what you're working on. Share what's working and what's not.
4. 2nd Sprint
5. Wider discussion of writing
6. Sometimes we have a 3rd sprint
I've liked it in the past when we can have a discussion on a topic. For the wider discussion of writing, I wanted to talk about ambiguity. I'm curious about when it works and doesn't. Ideally you could come with examples like short stories that leave you guessing or an ending the ambiguity undercut. I'd like use to have examples to avoid vague blanket statements. Any media like movies and TV shows as examples works.