Who_Am_I wrote:
I can see the logic behind it.
One would assume that the ordinary people line would have more people in it than the VIP line, since being a VIP becomes meaningless if the majority of people are VIPs.
Thus, if you're after the ordinary people line and you haven't seen the signs indicating which line is which, it makes sense to go to the line with more people.
Logic, not herd behaviour.
I think it's a combination of both logic and herd behaviour.
Logic: most people will not be VIPs, therefore the longer line is most likely the non-VIP line
Herd Behaviour: assuming that the other people in the line have checked that it is the non-VIP line, therefore you don't have to check, the "herd" has already done that work