David McCallum Hated Mark Harmon's Infamous NCIS Pranks
Learn More Even on darkly serious shows, the cast needs to maintain some levity to break up the tension. That was the case on "NCIS," as Mark Harmon, who plays Special Agent Leroy Jethro Gibbs, was a notorious prankster on set. Brian Dietzen knew this all too well, as he told Looper about a…
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