Why do people talk in codes?

"Erm, did that person...what's his name...we met him yesterday....get back to you about putting that thing on the cabinet..." What person? What thing? Why don't people think before they say something? Pure laziness. You've already got someone's attention so speak properly. That sentence just said makes no sense whatsoever and leaves the other person wondering what it was all about in the first place. Better not to have said anything at all.

As the saying goes "If you don't have anything nice to say, don't say anything at all" and in this case "If you don't have anything new and relevant to add, don't say anything at all". The amount of times (which funnily has increased tremendously since moving countries) when people open their mouths for the sheer sake of it has astounded me. They have more or less repeated the same thing someone else has said a few minutes ago or feels the need to hear their own voice or remind other people they're still there. Waste of time.