It is a Cyclone.
A six-foot-tall magician holds a beer mug on the top of his head,
He bends forward and let’s it fall to the ground,
When it hits the ground, there is not a spot of beer spilled,
How can this be?
As tall as a tree;
As small as a bug;
As fast as an eagle;
And as slow as a slug.
Many times in front or behind;
But never on top and always aligned.
What is it?