Supernatural (Anime)/Recap/S06 E14 Mannequin Three the Reckoning

Season 6, Episode 14:

Mannequin 3: The Reckoning
While Dean is called home to help Lisa, Sam investigates the case of a missing woman and discovers she was the butt of a cruel practical joke played on her by her co-workers.

Tropes
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 * Asshole Victim
 * Our Ghosts Are Different
 * Prank Date