He won't tell you where this high-line tightrope is, strung between a cliff and a rock outcropping over the ocean's edge near the Golden Gate Bridge, but we can tell you right now it's somewhere along the cliffs below Land's End, probably just north of the Sutro Baths.
In the video, pointed out to us today by SF Citizen, highliner Ryan Robinson says that this line sits "right under the noses of one of the most popular parks in the city." We're not sure if that means it stays installed like this year round (probably not), or if it's just a known spot with some sort of instructions for installing it. In any event, the federales probably wouldn't be to enthused about this, on national park land, if they knew where it was.
Also: so scary! Who does this?!