If you have been taking SMRT in Singapore, you will be hearing a woman group singing to remind and encourage passengers to stand in line, give way to alighting passengers when the train is arriving. In short, Dim Sum Dollies are promote gracious behaviour on public transport by singing.
Beside singing, their photos are pasted in MRT too. This is one of them to remind passenger to give up seat to those who need it more.
In this case, they remind you to "Give up your seat"...but what seat are they talking about?
or maybe someone have really given up the seat. See, no seat. LOL
If you are wondering who is Dim Sum Dollies, you can read more about them here.
Here's the campaign music video. Enjoy.