A few days before Christmas 2009 a colleague at the college arranged for all the students to join together and watch a video of the movie Love Actually. Towards the end of the movie, the character Joanna (Olivia Olson) sings the song All I want for Christmas is you, which a) is not really about Christmas – it might as well be All I want for any occasion is you, b) I am likely to have in my head all day now, and c) you are likely to have in your head all day now.
After the movie, a student said to me “She was singing ‘Is you?’. Should that be ‘Are you?’?”. I said (I paraphrase) no, because she was singing about “All I want for Christmas”, not about “you”. “All I want for Christmas” is singular, even if “All I want for Christmas” is “five gold rings, four calling birds, three French hens, two turtle doves and partridge in a pear tree”. The singularity or plurality of the gift(s) doesn’t affect the the form of the verb. On the other hand, if we invert the sentence and say “You _ all I want for Christmas”, then “you” determines the form of the verb.
Also late in the movie, the character Jamie (Colin Firth) travels to Portugal to make a declaration of love to Aurélia (Lúcia Moniz) … in very bad Portuguese. A student from Brazil was sitting in front of me (maybe he was the one who asked the question afterwards), and he cracked up completely during that scene.