We die to each other daily. What we know of other people is only our memory of the moments during which we knew them. And they have changed since then. To pretend that they and we are the same is a useful and convenient social convention which must sometimes be broken. We must also remember that at every meeting we are meeting a stranger.
The relationship of the toastmaster to speaker should be the same as that of the fan to the fan dancer. It should call attention to the subject without making any particular effort to cover it.
At bottom the world isn't a joke. We only joke about it to avoid an issue with someone, to let someone know that we know he's there with his questions; to disarm him by seeming to have heard and done justice to his side of the standing argument.