Kissing a random person passing in the street would probably be the most extreme thing to do. It is crzay, but life is no fun without some thrill.
Picture taken from here.
As I said before, life is not fun if you dont have some crazy stuff that will give you some adrenaline. Also, sometimes we see that very good looking guy walking in the street, and we think "I wish I could meet him", but we can't, so one day, I'll just pop up and kiss one of these, then walk by, as if nothing had happened. I think this is a very common dream among the girls. Haha.