Walk and chew gum

How is the saying go? "One cannot walk and chew gum at the same time." Recently I was thinking about this saying and was slightly confused. Is it "talk and chew gum," or "walk and chew gum?"

I thought, how could it be? Everyone can walk and chew gum at the same time. What's the point of that saying? If one cannot walk and chew gum at the same time, that person must be pretty uncoordinated, wouldn't you say?

As far as I know, people nowadays not only can walk and chew gum, but also can walk and talk and chew gum while texting and gaming at the same time. In restaurants, public transportations, parks and streets, we see people, walking or sitting, immerse themselves in their devices like zombies, as if the rest of the world doesn't exist.

Electronic gadgets are ruining people and their lives as we speak. Handheld devices and gaming consoles enable and encourage people of all ages to mindlessly shut out the the world and the people around them. Deeply attached to the manmade devices, pseudo social update snippets, and virtual reality games, those people behave like dull machines.

If nobody tells you so, then let me be the first one to say that such behavior in public is offensive and rude. Just because everyone does it doesn't mean it's right. Likewise, just because you can do it doesn't mean it's a good thing to do. Parents, take up the responsibility to teach your children the right behaviors right now, otherwise they will be spanked by the society sooner and later.