It happens in the most
unsuitable situations: when you are ordering in a
restaurant, when you
say something graceful at
work, when you
say something affectionate to your partner, when you are in class and
you come up with a brilliant answer...
This situation causes other stranger situations. For example, you can verify if it is certain that nobody listens to you, saying some nonsense. Then it happens something magic: everyone is suddenly aware of what you said, and then they think you’re crazy...
This situation (as almost everything) can be transferred to Everything: it happens when a writeup of you is ignored by the rest of users. And the worse thing is that the only remedy is worse than the disease: nodevertising can be dangerous!
And of course, this is also inconvenient in real life: repeating what one has said or asking if someone has heard what you just said can cause that the others look at you thinking… bah, you crazy pothead.