Using Audacity or another audio editing software, record yourself holding down both sides of a conversation.
Using the pitch changer and/or other effects, change your voice so it sounds like two different people are talking. Maybe they can be disagreeing about the kind of narrative you are considering for your course.
Export your audio file, and save it to SoundCloud or Google Drive so you have a link to share.
Example for "A Phone Conversation With Yourself":