The Marriott hotel in downtown Los Angeles, Calif. - 

This final note today, in which corporate America still, somehow, 12 years later just doesn't get it.

Herewith, two of the many marketing failures tied to this date. Number one: Marriott. The hotel chain has apologized for offering complimentary coffee and mini-muffins "in memory of those we lost on 9/11."

Item number two: The Tumbledown Trails golf course in Wisconsin. Nine holes with a cart, for only $9.11.

And the corporate blunders extend online too -- here are some of the most memorable corporate social media fails.

Follow Kai Ryssdal at @kairyssdal