Because I was really ticked off when I saw the Haines commercial last night about their new "Lays flat collar." Uhhh, People? The stranger dude was correct. It really is LIES flat, not lays.
So let's go over the definition of the two words again, shall we?
To lay: a transitive verb, requiring a direct object. It means to put, to place, or to set. It is conjugated thusly: I lay the book down today, I laid the book down yesterday, I have laid the book down in the past.
To lie: an intransitive verb, requiring no direct object. It means to recline, to repose, or to be situated. It is conjugated thusly: I lie down today, I lay down yesterday, I have lain down in the past.
Not to be confused with the completely different word meaning "to tell an untruth."
So just to be VERY CLEAR about this (because really, it isn't all that difficult), if something or someone is reclining or is situated in a certain way, the word to use it LIE. I lie down in my bed. The collar lies flat. The word LAY is used only when one wishes to say that something is BEING placed or set onto something. I lay the book on the desk. She lay the silverware down on the table.
So Haines? I realize you think you were being funny, really? You weren't. Please use your words correctly.