Grandma often played a small game with Mum during her childhood: they looked for touch-me-not plants (mimosa pudica or ‘shy grass’ in Cantonese) on roadside. When Mum found it, she tapped it lightly with her fingertip. She watched the small leaves fold up and said ‘good night’ to it. There are some small grasses that look very similar to touch-me-not plants, but the leaves do not fold up, and they are not shy at all. Nowadays, touch-me-not plants are not so commonly seen, so we specially planted a pot at home. Our child knows about this small game too. In the street, he likes to point to different weeds. If the leaves do not fold up, we say ‘Hello, not-shy grass!’