From livingsocial's deal page:
Chicago is a haunted city to say the least! Track down some real apparitions with today's deal from Chicago Ghost Investigations and get a haunting, interactive ghost tour for one person for $25 (regularly $50); or get scared in pairs with ghost tour admission for two for $50 (regularly $100). Tours are held at 8 p.m. daily and one featured excursion is a haunted warehouse located near Al Capone's headquarters, which is rumored to have had a role in the notorious gangster's illegal activities. Using cameras, sensors, and thermal scanners, you'll explore the premises and look for restless souls -- and you just might help put some uneasy Chicago ghosts to rest!