My favorites (so far) are a video on waste (too large of a file to insert here, but featured problem and what you can do steps), a video on the human equivalents for animal industrial farming, another video on body shaming, and a vegan/organic dinner party (picture below).
The only thing I will do to improve next semester is even more (there are already some) incremental reflection/change/mindfulness components to each assignment. The garbage collection assignment was already a massive success so I don't see why each assignment cannot have some sort of 'doing' component to raise awareness, engage, and leave me (and the students) less depressed about systemic/institutional social problems.