My DD and me were in town and this woman with a little girl smiled at us so I smiled back. She then asked how old my DD was, so I told her and asked how old hers was (as you do!)and exchanged a few words. She said she was from India and had quite a thick accent. I thought that was it so we made a move to walk on when she suddenly said 'come to my house' I thought she just meant anytime so I smiled. But she persisted,telling me where her house was and that our children could play together,she actually wanted me to go back with her there and then! I said I had some shopping to do but would her her number as she seemed a bit upset I didnt seem keen. So she told me her number and I said I would call.
If I had been sat down chatting to someone for a while and started getting to know someone it might be different but this took me quite by surprise!