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My favourite teaser?...

The first one that came to my head is the rave teaser, with the bucket (not the nurse!). A close second is with the nun by the bedside, Que sera sera playing very clearly throughout the trailer, and very subtly she drops her robes revealing a skirt.

I don't find them particularly scary, but that poster of the white nurse with the bleeding-black eyes horrifies me, and since then I've had a hard time watching teasers with nurses.