You know that split-second where you realize you've done something or said something and now it's out there and you can never get it back and it was really not a good idea even if you're laughing hysterically over it?

That's an OhNoSecond.

And they never fail to produce heart-stopping hilarity. Or a realization that you may have suddenly, terrifyingly, permanently created a rather interesting perspective (spectacle?) of yourself.

Oh dear.. :-)