Photoshop doesn't recognize itself?

OK, I got this from NAPP member Mary Lou Johnson, who got it from Ruth Knoll (wife of Photoshop creator Thomas Knoll). You know how Photoshop has a built-in spell checker, right? Here's the weird thing: if you type the word 'Photoshop' and run Photoshop's own spell checker, it flags the word Photoshop as an unknown word. Makes you stop and think, doesn't it?