One easy example is the military and how it changes your perspective on hardships and adversity. Or how about rehabilitated felons, who now see the errors in their past life.
On habits: I have a couple nasty habits of my own, but instead of just trading them for ones that are easily as bad, I utilizes them to further myself. For example, stalking has given me remarkable perception and helps me identify and predict human behavior. Like limey and his puppet here, they all only critique me for grammar, strongly dislike U.S. military, are British accented and are all quite coincidentally fond of you, Gypsy.
As for my grammar skills, it's not my lack of understanding the English language. More on the shit device I'm using. If we spoke you'd wouldn't complain.