Answer:
What is always coming but never arrives?
Which weighs more? A pound of iron or a pound of feathers?
Doing this with your job can be risky but doing it with smoking is always a good idea
You are on an electric train. Which direction will the smoke fly in?
What occurs four times in every week, twice in every month, only once in a year but never in a day?
It is something you will never see again.