Some daily-life examples to help explain what 'mindfulness' and 'mindless activity' are? In Buddhism there is a concept of mindful activity. But what actually is mindfulness? How does it differ from mindless activity?

Please help me to understand that: I've googled it a lot, but failed to gain insight into it.

I hope that some concrete examples from daily life might be the best way to explain it.

I am really bad at understanding theory, so if you can please give examples is daily life: for example, is watching a movie categorized as mindless or mindful? How to make it a mindful activity?

EDIT:
After receiving various kind help, I gain more insight into mindfulness. There are 4 types of mindfulness of phenomenon of the living:


the awareness of existence of the phenomenon of body
the awareness of existence of the phenomenon of feeling. such as pleasant, unpleasant, neutral feeling that arise
the awareness of existence of phenomenon of mind
the awareness of existence of phenomenon of mental quality according to buddha teaching. (i have not fully grasp of the last part)


Do not think that one of those four as the ultimate awareness. All of those awareness make whole awareness. 

mindlessness is like being a robot that fully functional. mindfulness is like being a fully functional robot that gain awareness of itself. please excuse me with the example

reference: http://www.accesstoinsight.org/tipitaka/mn/mn.010.than.html
When your Buddhism teacher tells you: "don't get irritated in daily life, don't get frustrated, be the master of your mind"

-- and then you come back next day and say, "I really wanted to be a master of my mind... but then I got carried away and yelled at my wife"

and teacher says: "but this was supposed to be your main practice, to not get irritated, didn't I give you instructions?"

and you say: "somehow, in real life, when we started arguing with my wife, it looked so real and so important, and your instructions seemed so far away and so naive and irrelevant"

and the teacher says: "this means you lack mindfulness. You must hold your practice assignment in front of you at all times, it must be the main thing on your mind - whatever else you do in daily life. Develop mindfulness. Do not get carried away."



So that moment when "it looked so real and so important, and your instructions seemed so far away and so naive and irrelevant" - is when your perspective (and with it, your perception of reality and hence your judgement) has shifted by the external circumstances. If you had mindfulness, you would be able to hold your perspective the way your teacher has set it up, regardless of external pressure. So mindfulness is really a basic form of jhana, being able to control your perspective, instead of you being a slave of perspective. Mindfulness is predecessor to meditation.