Dean: What's your name?
Castiel: Castiel.
Dean: You're named after an angel?
Castiel: Yes, my parents were very religious.
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Dean: Well, I'll see you around, Cas.
Castiel: Cas?
Dean: Oh, I'm sorry. I hope you don't mind me shortening your name to 'Cas'
Castiel: No, I like it.
Castiel: Castiel.
Dean: You're named after an angel?
Castiel: Yes, my parents were very religious.
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Dean: Well, I'll see you around, Cas.
Castiel: Cas?
Dean: Oh, I'm sorry. I hope you don't mind me shortening your name to 'Cas'
Castiel: No, I like it.