Cute Young Brunette Girl With Long Hair And Blue Eyes Reveals Her White Hat And Slip In The Barn With A Hay

The physics unit "barn", which is a unit of exceedingly small area, was named for the "barn", given the surprisingly large size of this property for a particular element.
Barn idioms
"He couldn't hit the broad side of a barn" is a popular expression for a person having poor aim when throwing an object or when shooting at something.