Answer:
People buy me to eat but never eat me
Everyone claims to know a way to stop these involuntary contractions but none of them work.
Causes bad breath and frightens blood-suckers
If you throw a white rock into the red sea, what does it become?
What has 2 banks but no money?
Even if you throw it away, it still comes back.
Funny
Animal
Difficult
Easy
Food
Kids
Logic
What am I?