The last time I had general anesthesia, they didn't give me any warnings but I had this weird prickly warm sensation in my crotch just before things went dark and I hated it but it's like just gotta bear it for a few seconds until I'm out.
Part of it is that Vine was a little too early. Phone screens were smaller, and people weren't used to watching videos on their phone as much as they do today.
The camera permission probably allows the app to either access the camera directly, or use a special invocation of the camera app that only gives access to the pictures taken during the brief period it's open. This doesn't convey access to the rest of the camera library. That's why it's a separate permission.
Me with Sherlock