So thus within a whyle as they thus talked the nyghte passed / and the daye shone / and thenne syre launcelot armed hym / and took his hors / and they taught hym to the Abbaye and thyder he rode within the space of two owrys

Drag Me to Hell capitalizes on the jump scare, scattering it liberally throughout the film to the point where it becomes almost numbing.

IIRC, the official explanation is currently that human history in the Trekiverse diverged from our history in the mid-20th century, due to the cumulative effect of multiple visitations from the future.

Alternative form: DOOMer