It's usually weird and surprising when you learn that celebrities are friends, especially when they seem so different. Take Justin Bieber and Usher, here. It seems weird at first, but then you get that they have a fun, big-and-little-brother relationship.... But then it gets weird again. Creepy details emerge that turn their "shootin' hoops and sloppy joes" activities into blackouts and subtle threats. Did we mention it's weird?