four by twos

A couple of blonde men in a pickup truck drove into a lumberyard. One of the blonde men walked in the office and said, 'We need some four-by-twos.' 

The clerk said, 'You mean two-by-fours, don't you?' 

The man said, 'I'll go check,' and went back to the truck. He returned a minute later and said, 'Yeah, I meant two-by-fours.' 

'Alright. How long do you need them?' 

The customer paused for a minute and said, 'I'd better go check.' After awhile, the customer returned to the office and said, 'A long time. We're gonna build a house.'