"Thanks for the grit" billboard reveals an advertising mensch

What is this curious billboard? Thanks for the grit? The kind that you can eat? No, that's grits.

Well, to find out there's only one thing you can do, go to thanksforthegrit.com and have your arrow keys ready.

And be prepared you might crack a smile because what it really is, is a thank you note. Or rather, a thank you billboard. No foolin'. The rarely seen very human and loving side of admen is revealed here in all of its glory as a Creative Director, Grant Sanders, thanks all his current and former colleagues for everything, although with better prose than I offer here. The thank you is specifically directed to ad agency Mintz + Hoke, in Avon, Connecticut. 

Bonus points to everyone who make it to slide 112.