Answer:
It can cause deflation of tires when dropped from the rear of spy cars.
Flat as a leaf, round as a ring. Has two eyes, can't see a thing.
One by one we fall from heaven down into the depths of past, And our world is ever upturned so that yet some time we’ll last.
Where do you go in through one hole and come out through two holes at the same time?
I work when I play and play when I work.
What is always coming but never arrives?