Remember the scene in Game of Thrones where Jon Snow hung his murderers? Turns out it wasn't CGI - they were genuinely dropped.
In a behind-the-scenes Thrones featurette, director Dan Sackheim confirmed "we really did drop" the actors.
"It's always kind of chilling because your initial reaction is visceral. They're in these harnesses that drop and it is a little bit of a shock to the system," he says.
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Brenock O'Connor, who plays Olly, says even though it's all safe and controlled, it's no less scary.