Because they won't commute.
You get an unpleasant vowel movement.
The position of the dirt bag.
Home on the Range'!
He left his home on the range.
He gets lost every time he checks the speedometer.
Whenever he had the energy, he didn't have the time.
When they find the position, they can't find the momentum. When they find the momentum, they can't find the position.
Because cross products don't commute!
