The moment when you IM someone something inappropriate when they are about to give a presentation and they forgot to turn off growl notifications
Seriously, it’s a thing.
Related: I was once about to start conducting a training with a whole room full of people at a client’s and my sister IM’ed me to yell at me for something. I hadn’t turned off growl notifications either. It is now the very first thing I do before I plug my laptop in.>