Answer:
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
What is in seasons, seconds, centuries, and minutes, but not in decades, years, or days?
If you drive on this, pedestrians and the police will be pretty upset with you.
What comes down but never back goes up?
Thanks for such treasures as Mariachis, enchiladas and habanero!
When is it bad luck to see a black cat?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?