Said to someone who fails to comprehend his or her own present situation. Often perceived as a misinterpretation of past events or activities. It is advisable to remind the person in question (if you appear to be in verbally discernible range), of his or her mistake to avoid any forthcoming embarassments on his or her part.
(Brief exchange prior to an imminent Science Test)
Karl: Hey Ev! *shakes his hand* Fail with honor!
Evan: Thanks. You too.
Karl: Ayan! *shakes his hand* Fail with honor!
Ayan: What?! Hey, I'm passing!
Karl: Ughh.
Evan: Haha, head up in the clouds Ayan!
When a man will search for hours to find something that is laying out in the open on a table. Items are often easily found by a women.
Man: "I have been searching for hours for keys."
Woman: "You mean the ones sitting there on the coffee table?"
Man: "Where?"
Woman: "Right there in the middle of that table."
Man: "oh, must have been Male Pattern Blindness"