Many years ago when I was a grad student, a friend and I decided to go Inter-railing around Europe for a month during summer break (Inter-rail is a student rail ticket that lets you take almost any train anywhere in Europe). Well, we arrived in Paris the night before Bastille Day, at around 10 pm, and found that the connecting train to the south (which we had planned to sleep on) wasn't running. So we were in a strange city with nowhere to sleep. It was a warm night, so we decided we could just crash out in the park until morning. As we got to the Park (after a much longer trek, carrying backpacks, than it had looked on the map!), a French couple was walking by, and they saw we looked a bit lost and tired. We explained our plan about kipping in the park, and started chatting. After a bit, they offered to let us come back to their flat nearby, and we were welcome to sleep on their floor! In the morning, they gave us breakfast.
A month later, on the train back to England, there was a German girl sitting opposite me. She was going to the town I lived in, and planning to get to the youth hostel there. Trouble was, the train was going to get in late, and she wasn't sure what time they closed for the night. So I invited her to come and sleep on the sofa in my flat. In the morning I bought her breakfast.