The Grey Menace

Flying saucers disguised as mushrooms
Mushrooms invades from outer space

Mushroom
Mushrooms invading the human body

There's an old story that says you can't kill a frog
By dropping him in boiling water
He reacts so quickly to the sudden heat
That he jumps out before he's hurt

But if you put him in cold water
And then warm it up gradually
He never decides to jump until it's too late
By then he's cooked