Our Lady of the Lake University (OLLU) in San Antonio is reportedly haunted by at least two distinct entities: Jack, a mischievous spirit who plays pranks like turning lights on and off and locking doors, and The Devil Nun, a sinister figure described as a woman in black with long hair, considered a bad omen. These apparitions contribute to the university's reputation as a haunted location, with River City Ghosts noting Jack as a well-documented ghost in the region. Jack: This friendly but mischievous ghost is known for playing pranks on campus, such as turning lights on and off, locking doors, and causing general disturbances. A darker, more ominous presence, the Devil Nun is seen as a menacing figure in black with dark hair, a symbol of bad times to come.