Your dog barked right as you were typing that last key = This is not as common, but can happen to the best of us.
You were in such a hurry to get to the great deals being offered and pressed a wrong key = Totally understandable, and that's why we built this page.
Your autocorrect has a mind of it's own = We have all been there and you have to blame someone, so it might as well be your autocorrect. Otherwise you would have to blame yourself... just saying!
Your trying to reach a page that is no longer supported = This is the worst one of them all. You see something you want and decide to check it out, just to find that the offer is no longer there.