Today we celebrate the existence of one of cinema’s most enduring oddballs. So many performances to choose from — the watch speech in “Pulp Fiction,” his recent spoken-word rendition of “Poker Face” on Jonathan Ross — but we’ll go with a classic, his Dwayne in “Annie Hall.” Walken’s on screen for maybe three minutes and manages to be one of the most memorable things about one of the world’s most memorable movies.