Answer:
I am tomorrow's yesterday and yesterday's tomorrow. What am I?
What has banks but no money a bed but no sleep waves but no ocean?
Of these things - I have two. One for me - and one for you. And when you ask about the price I simply smile and nod twice.
To you, rude would I never be, though I flag my tongue for all to see. What am I?
Railroad Crossing, look out for the cars. Can you spell that, without any R's?
When is it bad luck to see a black cat?