Got a good street opener for everyone 'Whats going on here??'. A little limited in use, there needs to be somthing going on.. a busker with lots of people around, or a parade/market/exhibition, ask it like you just wandered up and have no idea.
I had it used on me, at the Aussie tennis open, outside the main court watching the TV. She asked me that, I proceded to give her the score, it was a Federer game so everyone was watching. She looked at me funny and said 'No, whats going on here???' like she had just teleported in from Mars. So I gave a funny answer 'tennis!'. She so already knew that, she was in the paid to get in part. To this day I dont know if it was a opener (doubtfull) or if she was actually from Mars.