Like it.
But really, the real essence of this thread indicates CONTROL.
You need to try and maintain control of the situation at all times. As soon as you enter a room, you can start sussing out the areas and tables etc. where you may lose your control.
And as Nick says, if you start getting grief, they're obviously not interested in what you're doing, so move on.
It happens all the time, and is very soul-destroying.
I wish there was a way out of it, but once it happens, and a speccy has you where they want you - i.e. backed into a corner, that's it. Game over.
So, the upshot is, maintain control as much as possibly. Analyse each effect and it's pros/cons, and try to tighten up your performance in areas which leave you exposed to such situations.
Oh, and the topic of the day is PRACTICE, and that's relevant here, too. Being totally flawless is almost impossible, but it's good to get as close as possible.