When a leaf or a stem is sliced, the plant signals pain (or perhaps merely dismay) by releasing the gas ethylene over its entire surface
But it ended where it begun, in a mere common flight of joy
He is liable to abrupt swings in mood,eg from happiness to despair.
A throB of joy
But Joe was not glad.
In joy;in happiness
Oh, what a delightful piece of news!
No, I don't think I have. Well pleased to meet you.
Hm, am I glad to see you back safe.