>>10518699Just start wandering about in your mind more often.
Sitting down? Let your mind wander and you'll find out that you've been staring at a wall for five minutes and have only blinked twice.
If you do this often, people will probably start to notice and wave their arms in front of you to get your attention.
Just today as I was walking out of class I heard one of the kids I talk to every now and then say "don't piss off <my name>." Today was also a day where I didn't pay much attention to my environment, and as such people took notice.
I also recommend staring at your destination when walking. People will step out of you way (if they notice you staring, and especially if you're walking faster than most).