20 Things You Didn't Know About Halloween (1978)
17. Laurie's Song
As Laurie Strode walks down the road from the Myers House, she begins to sing a song about "just the two of us".
Unbeknownst to her, The Shape steps up behind her, intent on following her, perhaps because she reminds him of the sister that he murdered, Judith. Indeed, Laurie's song could even be interpreted as being an open invitation for The Shape to follow her.
What the audience does not realise, however, is that Jamie Lee Curtis completely improvised this song and yet made it so fitting, both to The Shape's rampage against Laurie Strode and (perhaps unknowingly) to the wider story that would be uncovered in the Halloween franchise.