Throughout nearly two full seasons so far, NCIS: Origins viewers have learned a lot about Leroy Jethro Gibbs, his personal life, and how he was molded into the legendary special agent and leader played by Mark Harmon seen in the mothership series. From explaining his rules to exploring his short-lived marriage to Diane (Kathleen Kenny), nearly every aspect of the Gibbs mythos has been touched on in some way. However, one thing the Austin Stowell-led prequel show has yet to reveal is the exact origin of his signature head slap, as typically employed on Anthony DiNozzo (Michael Weatherly) whenever he gets off track. It's been known for years that Gibbs' former NIS boss, Michael Franks (Kyle Schmid), was the first to employ it, but this week, fans will finally get to see it in action.
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