I have to confess, *on occasion*, on a tour, I suddenly turn into "That [Self-Appointed-Semi-Obnoxious-Comedian-Type] Guy". Whenever I am in a group of people and the atmosphere becomes too serious --- or worse yet, boring --- an irrepressible urge inside me wells up to counteract the starchiness with [what I consider] "humor". It's a gift. I become committed to the fact it is warranted, if not absolutely necessary, which, according to my wife is absolutely never necessary, and that I SHOULD be committed! It's especially evident when I subtly offer what I consider a well-timed, unsolicited one-liner. Deliver, pause, and with the usual self-aggrandizing smirk on my face, turn to my wife, expecting at the very least a sliver of a smile of approval, only to find her glaring straight ahead, jaw firmly locked, gritting her teeth and without lips moving, growling under her breath something to the effect, "If you don't STOP that, I'm going to the car!!"
I don't like tours that much anyway; they give me bruised ribs.