Answer:
What language does a billboard speak?
I have Eighty-eight keys but cannot open a single door.
When you are inside me you will be encouraged to slam other cars.
I am in the past, never in the future. I don't exist, but have existed. I saw what you saw, and this is what I will ever see. What am I?
They are many and one, they wave and they drum, used to cover a stare, they go with you everywhere.
When is it bad luck to see a black cat?