Dean opens the door to the bunker closet to retrieve a broom but opens the door to find Castiel standing there.

Cas: “Dean.”

Dean: “Cas! What the hell are you doing in there?!”

Cas: “I was looking for you and Sam informed me that you were in the closet and refused to come out, so I came to retrieve you and locked myself in.”

Dean:…….

Dean: “SAM!”