The theory that, any rock, no matter the shape or size, can still skip a considerable distance upon a body of water if spun fast enough. This theory disproves that a rock HAS to be flat in order to skip upon water.
NOTE: This theory was in fact proven through vigorous testing during a boring afternoon near a lake.
Kid: "Hey, that rock is squarish. It wont skip on the lake. You need to find a flat one."
Friend: "No, it should skip. Sean's Fundamental Law of Rock Skipping disproves that myth."
Someone or something that bites your ankles.
To a postman, an ankle biter is often known as a dog.
To an adult, an ankle biter may be a toddler.
To hikers, an ankle biter is sometimes a tick.
And so on.
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"