what's the first thing that would go thru your mind if you see someone spit?

I think spitting is so disgusting - especially on the sidewalk. If I'm not mistaken, I believe some places have outlawed spitting on sidewalks. I also think spitting in public is barbaric as it's plain to see they don't care about who may step in it, who may get a cold/virus from it, etc. I just think it's purely disgusting.