Two blondes drive into a lumberyard. The passenger gets out of the truck, walks up to a worker, and says she needs a bunch of four-by-twos.
"You mean two-by-fours?" the worker asks.
"Hm, I'm not sure," the blonde says. "I'll go check."
She walks back to the truck, and the two blondes consult a book.
"Yeah," she says after getting the answer. "I meant two-by-fours."
"All right," says the worker. "How long do you need them?"
This time, the sweet young thing didn't even need to consult the book.
"A really long time," she says. "We're gonna build a house."