Now you're just showing off! Four guys, four iPhones, four videos, all synchronized to create one elaborate video set to Fun.'s 'We Are Young'.

Some online viewers of this video by MysteryGuitarManare crying "video-editing trickery" but the behind-the-scenes videos at the end make me believe it's all real. 238 takes? I wouldn't be surprised.

If you're one of those people that whines because you can't sync your contacts to your mobile device, this video probably isn't for you.