Beginning tonight, The Essentials host Alec Baldwin teams up with his old 30 Rock co-star, Tina Fey, for his latest round of animated movie discussions. (It’s the discussions that are animated, not the movies.) Tonight’s topic, “Eyewitness,” is about movie characters whose lives are changed or threatened after they witness something significant – and allows Baldwin and Fey, and us, to revel again in Alfred Hitchcock’s 1954 masterpiece, Rear Window, starring James Stewart and Grace Kelly. What a movie. What a visual master stroke. And Grace Kelly? What a beauty, and what a flirty, playful, self-assured actress and character… the ultimate of all of Hitchcock’s icy blondes.