text: I know, I've noticed it too.  I think it's like a complete stranger asking you to be part of their fun that does not involve anything nasty.  And they're telling you that they trust that you are not going to damage their stuff and that they trust that you'll take an awesome pic.  They're happy to be there and want you to be part of it.  And it's like two happy bubbles touching for just a second.  Then, you're both off on your separate ways.  \n\nI don't know why that's so pleasurable.  Kinda weird I guess.  People in other countries are just as super happy?  I'm not sure.