Okay, so it's not really an obsession, per se, but I love this app. (It's free, too! Woo hoo.) You take a picture of yourself, or upload it from Facebook. It detects your eyes and mouth and animates you into a MOVING ZOMBIE!! It's just so amazing, okaaay?
Here's a little sample for your entertainment.
Another note: if you let it sit for a while, it will rot and become an even worse zombie over time. So cool.