A well-placed verbal putdown, in a break in the music, and in the presence of others, will often serve to clip the wings (or the horns) of those who might otherwise be unembarassable or inconvincible (sorry if it seems as though I'm making up adjectives, here).

Something like, "You know, I find it intriguing that there are as many eedjits in the world so remarkably impressed with their own lack of cleverness." This approach may be too wordy, and perhaps overly subtle.

Of course, if they are intent on making asses of themselves, all the more reason to ***-ist them, no? A suggestion that they traipse down to the men's locker-room of the local athletic club for a more open view of a bunch of men's hairy backsides may be just the ticket. There, they can be assured of meeting up with any number of attitudes more in keeping with their sophomoric intentions.

I've been propositioned by unsober married "ladies" in settings that might otherwise have been extremely embarassing or compromising. I've either called them on it within earshot of their mate or friends, or suggested that I buy them another drink. I intend on making certain that it's double-plus strength, and secretly hope that they, as a consequence, have an URK-K-K-some night praying to the porcelain god, and a big fat achin' heid the following morning. Regardless, just the excuse of going to the bar on their behalf will give one the moment necessary to slip away, or engage someone else in more reasonable conversation.