Cutting queue is one common thing.
I even experienced b4 queue-ing in bookstore in one straight line,
but suddenly one auntie queue beside but at the front of me.
And then slowly, more ppl queue behind her instead of the correct line.
Look at our country, wrong thing also can become right.
Aikz....

Anyway, i believe if u told the person who cut ur queue about it he/she will till cooperate with u.
While if u are so unfortunate, probably he/she will just ignore u.

Another related one is the act to be the first instead of slowly cutting the queue.
Example, when the train door just open, just walk into the train before letting anyone out from the train. Same to the lft.

That is consider psychological problem adi.
Need seek help from psychologist.
This psychological problem also apply to some of the rape case out thr.