I'm afraid most of the crazy stuff I've done isn't safe to share in a family forum, but when I was a teenager one of the things some friends and I liked to do was stop in the middle of the mall and look up, to see how many other people we could get to look up just because we were. The answer? A lot! We also used to do Polaroid treasure hunts in the mall, where instead of bringing back an object, you had to bring back a photo of whatever was on the list, including things like a guy in a tuxedo eating ice cream (we actually did get that one).