Answer:
There's one in every deck of cards and in a famous movie
What is it that given one, you'll have either two or none?
You walk into a room with a match, a kerosene lamp and a fireplace. Which do you light first?
Proof you've done your time in school
When it's dirty this should never be aired in public.
I am a room that has a roof but no walls. What am I?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?