Cause your the only one Hair.
or
The letter H.
or
He made sure his pools were clean and his lawns were mowed.
or
A snail because it carries it's home.
or
Because the teacher said it was a piece of cake!
or
When it came time to pay, the skunk didn't have a scent, the deer didn't have a buck so they put the meal on the duck's bill.
or