We're all completely vulnerable all the time, we just hide it behind clothing and other things. But we fool ourselves if we think someone can't get to even the most powerful of us. We're all very vulnerable and we all find ways to deal with it. Marlin throws over bikini underwear. Heckler takes a pencil from his pocket and lifts the underwear.
Heckler throws the underwear onto the other clothes.
Now this trick, to be effective, must be performed totally in the nude. We need some pretty young lady to come on stage and verify that Marlin is totally nude. All say no, with varying degrees of embarrassment. Heckler returns to the stage. But everyone in the audience is hung up on their own vulnerabilities.