When I was younger, my family went to a church function. I can't remember what it was, exactly, but I know it took place at a local church.
At one point, my brother (who was really young at the time, maybe 6-years-old or so) was sitting on my dad's lap. This woman just walks up, yells some random kid's name and says, "Where have you been? I've been looking all over for you!" and hugs my brother. My dad grabbed my brother back and said something like, "This isn't the kid you're looking for", and the woman just walked away.
Supposedly someone saw her afterward just grab a random baby buggy and walk away with it. I have no idea what happened to her after.