There are a few exclusions to this:
Old People, people with prams (must have child in pram), pregnant women and people with walking aids/wheelchairs.
Anyone else is fair game.
There are two types of people who walk without looking where they're going:
busy people - they know where they're going, they're in a hurry and are usually deep in thought about other things. They are the lesser of the two evils.
people who are up themselves - usually female (though not always), people who spend a lot on cosmetics and don't watch where they are going because they think people are watching them (and will thus avoid a collision).
The second kind is the funniest to walk into. Today I did it at least five times. The trick is not to knock someone flying but to give them a jolt.
This one lady started yelling at me that I should watch where I'm going and that she was a poor defensless woman and I was nothing but a brute.
This dude decided to ignore the advice of fellow junky William S. Burroughs - never get involved in a boy girl fight.
He came along all, "what you doing? I'll bust your face!" I laid him out with a kick in the balls.
Then I turned to the girl and smiled sarcastically. She hit me with the most beautiful smile I've ever seen, and asked if I'd buy her a drink. I obliged and we got along famously.
Her name is Sweet Lips (that's the only name you're getting) and we're meeting for cheapo Tuesdays at the Dublin Road. I dunno what's on, hope it's a horror!