Just the simple act of praying over a meal in public - Something my family does, just as a matter of course, any time we sit down to eat - The responses to that act are wide-ranging, though often positive. Folks are watching more than one would realize.
My experience as well. When I lived in DC, I was entirely dependent on walking plus the Metro for my transportation, so it was a good opportunity to walk or sit or stand around with my rosary in my hand. (Rosary people will know what I mean. These are times when your mind is free and you have time to pass.)
Never was particularly ostentatious, Never got a bad reaction from anyone. And several times, a wayward citizen would come up and sit next to me on the Metro train or catch up to me walking, and start a conversation that would go something like this:
'Scuse me,Ma'am. Uh, you a nun?
(No.)
But that, that's a rosary, right? A religious thing right?
(Yes, it is.)
Could I ask you to pray for my brother? He's an addict.
(I'll pray for him.)
His name is Wyatt Lee. He's addicted real bad. He really needs prayers. Thank you Ma'am. Are you gonna pray for him today?
(Yes, I'll do it today.)
Today and tomorrow, OK? Because he's in court tomorrow.
Sometimes they'd want to confess some generalized sin.
"I..." (Long pause) I messed up my first marriage. Man, (long pause) I was messed up. I was married to a beautiful woman but I (long pause) messed up."
I just had to say one or two sentences, maybe, like "Ask God to forgive you and give you a new start. If you're thinking about another woman, respect her. God bless you both." And then the person would quietly move off. I felt like I was a small movable shrine. If I helped some poor fellow stragglers find peace, well, what a wonder. Amen, Lord.