This is a reference to Chapter 196 of Gintama (featuring the haunted hot springs inn, Senboukyou), which is one big extended reference to JoJo (with the haunting spirits being referred to as "Stands" because Gintoki is adamant on not uttering the "G" word).
Admiral_Pectoral said:
Gintama references are the best.
Yo dawg, I heard you like JoJo, so I put a JoJo reference in your JoJo reference, so you can...
