Some games are fun, and some games are bad,
And some games are fun games that make you feel sad.
What is invisible, though you always see it,
Is as common as breath, though it hurts when you breathe it?
What weeps like a willow, for reasons unknown?
It often grows from seeds of the trees close to home.
It comes in three flavors, ceramic or steel,
And then there's the flavor that learned not to feel.
If you know the answer, I'm both sorry and grateful,
Though the key to the riddle is really quite hateful.