You man a "tower" at an uncontrolled field? Do you fly an RC airplane as well? I mean this in the nicest way possible... but I think you might be gay.Geez, that was a close call. I wonder how many of the pax were aware of just how close they came to having their names appear in the newspaper today? I can relate to what would’ve likely flashed through the mind of the controller in that instant. Although I was never actually in ATC I used to do Unicom in a decommissioned tower at a fairly busy uncontrolled GA airport; that averaged about 300,000 movements per year. One busy afternoon I witnessed an incident that was similar in circumstance to the one that occurred today in HNL…a Cessna was on the roll after a touch and go when a Trinidad, that was taxiing, decided to cross the active runway at mid intersection and right in front of the other a/c that was rolling for takeoff. Just prior to this my attention was diverted inside the cab, as I was recording the movement of the rolling aircraft, on its strip. While I was doing that I heard the taxiing Trinidad announce that he was going to cross the active. Knowing that there was an aircraft on a touch and go I immediately looked up, and seeing what was about to occur I blurted out an advisory to the a/c crossing, “JCC hold, aircraft rolling on the runway!” The guy in Trinidad yanked on his brakes so hard I thought he was going to strike his prop. I watched as his aircraft rocked back and forth, still partially on the runway, as the Cessna whizzed past and got airborne only meters away. The pilot of the Trinidad, in a very grateful voice, thanked me for the heads up; I wonder if it occurred to the Herc driver to do the same?