Alright, so today’s app isn’t the most practical one you’ve ever seen. It’s not even the most clever. But it’s fun and easy to use, and it’s Halloween, damn it. Boo Halloween is a quickie photo app that lets you put a variety of spooky faces on pictures of you and your friends using reasonably accurate facial recognition. It comes with six masks — four of which are pumpkins — and you can buy nine more for a dollar if you think your buddy would look better as Batman, a zombie, or Billy, the puppet from Saw. Not much to it, but it’s silly, and it made me chuckle.