chit chat

It's been a while since I've been on here so I thought I should make a contribution today or some random thoughts.
It seems like after you learn a new word or hear a word that you haven't heard in a long time, suddenly you hear it multiple times within days of the first hearing. Have you just been unobservant before or is this word actually being spoken more? That happened to me with the word via. It was just weird. I don't use the word via very often, but maybe everyone else does.
Meanwhile, I'm stuck on the words "chit chat." The past few weeks whenever I am talking about talking I use the phrase "chit chat." It's kinda getting on my nerves. I have to make conscious effort not to use it.
Further meanwhile, the lady next to me in the computer lab is typing up an essay which I can only imagine is due for finals which are just around the corner. My eyes may or may not have gotten a little wandery and I may or may not have read the first paragraph she had written. And straight off I can tell she's not a native English speaker. Do I say something? Like, "hey, noticed all your writing was terrible, maybe I can help you?" Dilemnas.
It reminds me of the time I was in the city library back home and I saw a 12 year old boy looking at porn. I didn't know what to do, but he got off a few minutes later and I let it go. Probably shame on me there.
I need more gumption.