Walk by a hot girl who’s standing/sitting by herself or slightly away from her group of friends, and deliver this over the shoulder:
You: “So why are you standing/sitting there trying to look mysterious?”
Her: (smiling) blah blah
You: “Yeah, see… you got that mischievous look on your face like you just did something bad and got away with it”
She should be smiling and laughing by then if delivered right.