Lumber

Jeb and Jethro live in the hills, about 5 miles outside of town. Jeb asks Jethro to go in to town to pick up some lumber. Jethro walks the 5 miles to town to the local
lumberyard.
"Jeb says we're gonna need some 4 x 2's" Jethro tells the yardman.
"Do you mean 2 x 4's?" asks the yardman.
"Well, I don't rightly know, I better go ask Jeb" says Jethro and walks the 10 miles to the hills and back to town.
"Jeb says we're gonna need 2 x 4's" Jethro tells the yardman.
"Now, how many 2 x 4's will you need?" asks the yardman.
"Well, I don't rightly know, I better go ask Jeb." says Jethro, and again walks the 10 miles to the hills and back to town.
"Jeb says were gonna need about 40 of 'em" Jethro tells the yardman.
"Now, how long will you need them?" asks the yardman.
"Well, I don't rightly know, I better go ask Jeb" says Jethro and yet again walks the 10 miles to the hills and back to town.
Upon returning Jethro says to the yardman, "Jeb says you better give 'em to us for a while . . . we're gonna build a barn."