During your period when your vagina feels like it's sagging (eg. like an old lady) and hurts like it might fall off.
Boy: Hey you wanna hook up tonight?
Girl: I have Old Lady Vagina Syndrome (OLVS)
Boy: What?
Girl: If you come near my vagnia, I will decapitate you
Boy: Well that's a definate no then...
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"