(as you travel through the wasteland you approach a man with a vault suit with the number 77 on it. He also has his left hand in a vault boy puppet.

(the man says "Hello say hello vault boy!" The puppet stays motionless he says " so uhm... I might've gone a little crazy stuck in vault 77 with just a crate of puppet but whats it to you!" he shifts his tone to angry near the end of that sentence)

( He clearly has lost his mind and has mood swings)