You were walking, minding your own business when Jack-O floated down sitting on a large version of her prison chain ball, as it spun around until it came to a stop slowly. Once it stopped, Jack-O hopped off the ball and it went back to being its normal size. She did a sort of Halloween 'Boo' pose, and then returned her right hand to her hip while holding her mask in her left hand. She spoke with her left eye closed.

Jack-O: "I'm gonna GETCHA! ...uh... just kidding."

She puts on her mask and gets in a fighting stance, preparing to fight you.