Answer:
What contains zero calories, but if you consume it, you will probably gain weight?
What starts with a 'T', ends with a 'T', and has T in it?
I'm tall in the morning and short in the noon. I disappear at night but I will be back soon.
What makes a loud noise when changing its jacket, becomes larger but weighs less?
Useful tool for who in darkness dwell. Within you, corrupting like a deadly spell.
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.