Create a video in which you play two different characters. In at least one image, both characters should appear in the video at the same time.
Many video productions use a single actor to play more than one role. In the old days, think Patty Duke. Eddie Murphey has some some hilarious scenes in which he plays multiple roles. In these movies, he actually argues with the other characters that he plays. There are many ways to create these effects. Seek out some alternatives. Some are easier than others.