I haven't used duck grass in years, but when I was out for my run this morning, I went past a whole field of it. I couldn't resist, so I plucked off a piece of grass and took it home with me.
When I got home I serenaded my cats with the duck grass. They stopped whining for food, put their ears back in startled astonishment and stared at me with wide, terrified eyes. I laughed so hard I got the hiccups.
It's fun to do things that hearken back to childhood every now and then. And to annoy your pets.