Kim Kardashian and Kourtney Kardashian have shared an unexpected teenage prank from their past. The revelation unfolded in a recent episode of “The Kardashians,” which began streaming on Thursday, October 5. During a visit to Century City mall, Khloé Kardashian, the younger sister of Kim and Kourtney, playfully exposed her older siblings’ youthful antics. Khloé, 39, informed the cameras about their past mischief, saying, “This mall has been around for years. You should ask Kourtney...