Just discuss the last thing you watched, movie, cartoon, anime, whatever. You can give a quick review or summary or whatever you see fit. It can be something you've never seen before, or something you've seen over a dozen times. It don't matter to me. Just discuss whatever the last thing you watched was.
I just finished watching a couple of episodes of Azumanga Daioh with my bro before he went off to work (The New Year's Dream episode and the first Culture Fest episodes, in that order). It's one of the funniest shows I've ever seen. If you aren't already familiar with it, it's just about a group of high school girls living life during their time together in high school, and every day for them is pretty wacky. It's something you could watch twenty times over and it'd still be hilarious. I can't recommend it enough to anyone who enjoys anime. Personally, it's a must see for anyone who calls themselves an anime fan.