I cover a basic theory of the external world unit in my introductory class. In epistemology, my students and I talk about failures in perception as either counting for reasons to be skeptical, or at least open to the fact that we should be humble about what we are most certain about in perception cases. And today, I saw this floating around the internet.
Needless to say, this video is madly philosophical for all things epistemic.
I really like my classes this semester.