Situation 1: Very good friend, your children are very good friends. You find out the hard way she's a TERRIFYING driver, often not having EITHER hand on the steering wheel, reading while driving despite you offering to read the directions, tailgating, actually turning around to talk to the kids in the back, etc. etc. Do you say you're uncomfortable, or are you too busy praying for your and your child's survival, LOL?!
Situation 2: Someone you don't know but run into repeatedly (mom of another kid in your kid's extracurricular program) is absolutely berating one of her children in a very demeaning way with very scanty reason. This goes on and on and is very obvious. WWYD?