MIA-LHR BA208 yesterday.
A380 - full - so plenty of people.
Before boarding even began, the roped off area for group 1-3 was jammed with passengers.
When group 1 boarding was called, had to find my way through the crowd in the roped off queue passage to be able to get on board. "Excuse me, excuse me...." People just standing in the queue leaving no room for anyone to pass.
I had a friend behind me in group 2. He told me later that they forgot to call group 2, went from group 1 to 3. And that's when everyone tried to board!!
Pointless exercise.