Does Kato Kaelin really qualify as a celebrity? I mean, it's been fifteen years since he had his fifteen minutes. Besides, his name sounds like something you take for diarrhea.
My one celebrity encounter was meeting Robin Curtis on my 24th birthday in 1994 at a Star Trek convention. My mom had arranged it in advance, and when Robin and I were introduced to each other, we spent several minutes talking before she went on stage. I wish I could remember about what, although she did say that she enjoyed meeting the disabled fans. Then later, at the autograph signing, she called me up on the stage with her (several guys grabbed my wheelchair and lifted me up there) and Robin led the entire convention in singing Happy Birthday to me.
Mark Goddard of Lost in Space was also there, but we didn't meet.
I met Mark Goddard at a comic book convention and found him to be a remarkably friendly guy. He was kind of in the back and at a table pretty much alone and I stood and chatted with him for probably a good 20 minutes. He was selling autographed photos but I don't buy such things and, to my surprise, he never even mentioned it. We talked about his show business career and he even reenacted a few scenes form an episode of "The Beverly Hillbillies" he'd been on after I mentioned it (just to make sure he knew I knew more about him than just his time on "Lost in Space"). He really seemed to enjoy talking about the good old days. He spoke kindly and fondly of Jonathan Harris (Dr. Smith) and talked about how everyone associated with the show was so very surprised that it was still generating interest nearly forty years later.
I've read accounts of others meeting Mark Goddard and finding him an irritable or an unlikable personality, fixated on selling autographs and wanting nothing to do with "fans" if they weren't buying something from him. This was NOT the person I met. I found him a genuine, likable and even enthusiastic person who enjoyed reminiscing and who never even mentioned trying to sell me something. I talked with him quite long enough that I'm sure he realized fairly early that I wasn't going to be spending any money but he didn't seem to care. He chatted away quite happily as if we were old friends just the same. A VERY decent and nice man, in my experience.
Well, I can't tell you either way, because like I said, he was present but we didn't get the chance to speak.