Well that was interesting. Until it suddenly wasn't.
I Really liked what boomerang said
"To me it is sort of like a "Vonnegut or Palahnuik "echo" that refers you back to something earlier, or focuses your attention on what is being said."
Yes. So is very Vonnegut/Palahnuik.
When I read them, I always have a strong sense of the interwoven fabric of existence. The echos, and the foreshadowing.
Life is strange and marvelous, and "so" to me is an indicator that I'm letting you or someone in on this secret.
BTW, that wasn't the thread. I remember someone who in different threads was just moaning about it, until I told him to STFU.