I am not sure if this is a new one.. but i can't find any reference to it and nearly got scammed... so be careful....

I was walking alone Nanjin Road with my partner, sightseeing of course. We saw a group of people are taking pictures (5 of them and one of them was holding the camera). When we walked pass them, the one holding the camera said 'excuse me, can you take a picture for us?'
So my partner and I stopped and ready to help them to take a picture. When he handed over the camera, i saw that the camera was not on (he was stilling holding it at that time...). Then another foreigner walked pass my partner and told him 'it is a scam... just leave'. So we left.

Come to think about it... it is strange that they said 'excuse me' and stopped us instead of MANY MANY Chinese people around... when we were on our way back to the hotel, they were still there taking pictures.... They could have dropped the camera and said we are the one who broke it... they could have given us an already broken camera and said we broke it... and all 6 of them would be onto you (note that they may also take that opportunity to steal your wallet...)