There's several pieces of CCTV footage that show what has become known as the "bystander effect".
One particular that I recall is a shop that has been set on fire due to arson, the customers just stand in the queue doing nothing while the place fills with smoke and fire. Once one person decides to say something, the others do too.
It's also called social conformity.
I was in a McDonald's which had a small fire starting behind the fries.. and nobody did anything even though it was clear the fire wasn't going to put itself out (it was at the back, visible at floor level). Staff just looked on, and it was myself that said it was probably a good idea to get people out. They ignored me, until the fire started to get worse and became visible as it started to rise up the back wall - and only then someone decided it was time to go.
It was quite amazing that because staff did nothing (certainly nobody tried to put it out), everyone in the restaurant was happy to stand and continue waiting for their food (or eating their food at their tables).
The fire brigade turned up and got everyone out and away from the building, without messing around.
I'd say that's a good example of the bystander effect.
To this day I am amazed that staff did so little (perhaps having insufficient training - but I suspect a few words were said by the firemen) but not that people acted like sheep and didn't want to be the first person to get up and leave.