The Kar-Jenners have had their fair share of feuds and feisty moments on screen. The Kardashian sisters have been known to fight, not just verbally, but physically, too. The famous family is known for being super close, but friction can build between the siblings – and even their best friends. As fans patiently wait for a new season of The Kardashians to arrive, some will never forget the throwback moment from KUWTK where Kourtney Kardashian slaps Jonathan Cheban. Throwback to Kourtney and Jonathan’s fightDespite Keeping Up With the Kardashians airing years ago, fans are still remembering many…