Case of the Ninja Auntie Brigade in Singapore

So we were happily queuing for tau huay at a slow-moving queue one day when suddenly, out of nowhere, an auntie had sneaked up from behind us and cut our queue! The service staff did not notice that we'd come first, and we let it pass since she was an old lady. Yet just minutes after that, another (slightly younger) auntie tried to sneak up on us and cut our queue again! Luckily this time the service staff AND another lady queuing behind us noticed this and told her to queue up :pAnd it happened again!! This time while queuing for ridiculously expensive yong tau foo at Food Republic, a woman in her 50s sneaked up from behind and shoved her bowl into the cashier's hands just as i was going to hand mine over...The cashier saw that i was upset, so she reminded the ninja auntie to queue up next time but still served her first :s Yet the shameless ninja auntie pretended as if she did not hear, or did nothing wrong!! :s :s :s If she'd at least apologized...