The X-Files: Jose Chung's From Outer Space (ep 320)
Over the last couple months I've been watching the X-Files since I'd only seen an odd assortment of episodes when I was younger. I've thoroughly enjoyed it, to say the least, and I just got to this episode last night and it blew me away. One of the smartest, funniest episodes of television I've ever seen. It plays with perception, memory, and the idea that the Truth is a very subjective thing, while also being laugh-out-loud hilarious. Highlight of the season, and maybe even the series so far.
I can't believe Community never tried to riff on this.