The crowds there are horrendous, the mainlanders take pushing into a queue to a whole new level. Normally when you're queueing for something and someone tries to push in, they'd slowly shoulder into position. With the crowds in Ocean Park, they physically barge you out of the way so that their entire family gets in front of you.
Then there's the underground carriage. We took the cable car first and then the underground on the way back. Normal MTR crush doesn't even compare, think Tokyo commuting hour crush. The carriage which I was in actually reopened its doors and the attendant had to ask for some people to get off as it was too overloaded.