Answer:
I can generate fear and some say I come out of your ears. I am as quiet as a mouse but not welcomed in the house. What am I?
What comes in many different sizes but is always only 1 foot long?
I drive men mad for love of me, easily beaten, never free. What am I?
What has many keys but can't open a single lock?
I have hundreds of ears but cannot hear a thing. What am I?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.