The two balconies of our "flat" are strictly off-limits to the kids. We always keep the doors locked and closed and they have to get permission to stick so much as a toe outside. As a result, they are very afraid to go out there. (Good.)
Yesterday, after hanging the laundry, I neglected to lock up immediately and BR trotted onto the balcony. I saw him right away and called out to him to get back indoors and (for once) he rushed to obey.
"Whew," he said, "I almost died."