Silence, makes everything goes perfect!

Have you ever in a dilemma whether you should speak up more or just remain silence?
I personally feel that, remaining silent is either a better choice or the best choice in solving argument, differ point of view and etc.
When i sense the "no-no" signal sent indirectly from another party while we were having a normal conversation, i, will prefer to remain silent. In my point of view, it is a way to avoid quarrel or misunderstanding.
when I sensed something is wrong,
when I am not into the mood for responding,
when I am sick of someone who threw me those silly and ridiculous questions, and
when my request is rejected due to some unacceptable reasons and bla bla bla
I will stop uttering words out and zip-up my mouth!
And until today, I still find this method useful as we will be meeting different kind of human being as we grow.
By showing off my poker face and keeping myself in silence, are you able to read what is running in my mind? =)

By Jes