For 13 years, Michael Weatherly's Tony DiNozzo was a source of laughter on NCIS, when he wasn't busy saving people, and it's never easy for someone to get used to a life where all that has completely changed. As the actor said in his interview with TVLine, Bull keeps him mirthful as well, and that's understandable on a show where Freddy Rodriguez is involved, but I'm sure Weatherly and co-star Jamie Lee Kirchner aren't already sharing the kind of inside jokes that he'll always cherish. You have to build up to that kind of thing. I mean, unless some mega-fan has a voodoo doll of Weatherly out there that he or she tickles to make him spontaneously laugh throughout the days.