My family at one time volunteered at a veteran's homeless shelter quarterly. It was with a group of people from our church. We had gone several times. I had a small baby that I was wearing on my body with a wrap while serving the food, and I would occasionally mingle and talk with the veterans while they ate.
One evening, I was speaking to two men at a table and one asked me where I lived. I didn't take it to mean anything other than the general town I was from, which I told him. It was nowhere near where this shelter was.
But then, the other man at the table, who I had never seen before, looked at the other guy and told him exactly how to get to my house. He told him where I lived.
Then he looked at me and he said, I used to live on the hill across the road from you. I used to watch you all the time. You and your children.
So that was the last time I volunteered anywhere like that. I reported him to the shelter director. He was a registered sex offender, I found out later, and he DID live across the road from us at one point. I've never been so creeped out in my life.