Not exactly a journal, but for this challenge I decided to convert a little piece of the Presentation Skills workshop (classroom-based) I used to facilitate. One part of the workshop was dealing with how to prepare an elevator speech specifically for your presentation. I took that idea and put it into an e-learning format to ask the learner to a) write the speech and b) present it in the actual elevator.
Here's the submission:
http://bit.ly/1Wjm2v7I haven't tried this on real people, so I'm not sure if a lot of learners would actually present their elevator speech to the screen - I'm guessing this would depend on their location (e.g. open office is a no-go for this idea) and whether they are interested in the practical activity and willing to use it at least as a fancy timer. :) In other words, some prototype testing would be required if this would've been a real project!