So apparently Sam is a default shape for shifters to take by accident
First Tommy, then Luna! (just saw her do it, on S5E8) Haha! Ridiculous!
The conversations between Sam and Luna-Sam were the weirdest thing I have seen on nearly five seasons of this show. And when Luna-Sam walked into the police station where Sam was with Andy, Andy's looks and "I fckn hate this town" was hilarious!