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In China I have seen much more than that "only in China"!!! that pic looks still has lot of space and could fit more people... haha...
What I have seen was people not able to walk at all... not able to pick your cellphone if it droped down... and sometimes you might feel your both of feet are not touch the ground... and you following people moving without move your own feet!!!
I have experienced the same thing once, but in India. I was at the Golden Temple, after the prairs they give food for everyone. The doors to the HUGE dinning room was closed and people and more people were coing to wait for them to open, When they finaly did I couldn't move at all. All people around me were moving, and excactly like you said it, my feet didn't move but I did. They told me that many children are seperated from their parents and never found again at that place.