Our last iteration was charged with frustration. This gave me an opportunity to try out a timeline activity that looked at events and emotions, instead of our usual iteration retrospective format. Our burn-up chart was used as the actual timeline. We placed each story card on it at a location corresponding to the day it landed in the done column on our planning board.
We stuck color-coded post-it notes to the timeline representing key events, and added color-coded dots to reflect the emotions of individuals during those events.
The completed timeline looked like this: