Antichrist (2009)
Artificial Eye

A simple act of self-indulgence has shattering consequences for a middle-class couple. He (Willem Dafoe) and She (Charlotte Gainsberg) loose their young son, Nic, while they make love. While they are caught up in each other, we witness as their son climbs up onto a window ledge and walks off, falling to his death. She climaxes at the point of impact/her sons demise.

Grief stricken, She is almost on the verge of a breakdown, so...