Unrelated, but I was at Ho Chi Minh international a/p a while back. Linning up for a security screen to exit.
There was a airport worker who opened up a new exit point and was flagging down lite/bagless travellers to simply exit. There was this Korean (heard them speak) couple whom the man wheeling a luggage cart was following everyone else to queue to go through the security check. The woman was following a good distance behind, but bagless.
She was flaged to go through and she kept trying to drag her partner through while he was queued like everyone else. They were yelling at each other as the man was pointing to the luggage xray while the woman was pointing towards this open passage.
I had exited before seeing the outcome, but some people are clueless. Probably see a shorter queue and cram that one until told otherwise by the airport worker.