Okay, sure, Angry Birds is a fun game, but what exactly has turned it into an overwhelming cultural phenomenon? Lord only knows. You can expect to see the series' titular fowl all over the place this Halloween, as some companies are actually making retail costumes based off of them. I'm sure there will be many, many homemade Angry Birds costumes as well. These costumes break the most essential rule of Halloween: they're too bulky to get up to any mischief. If you can't fit through a door, you're in a bad costume.