My class friend got promoted to lieutenant after military academy training, so we had a nice little party. It ended up at my place, which had one final exam for the guy.
There are gates to the yard, which can be opened remotely, and there’s intercom. And few meters inside there’s a white button to open the gates, if you have to get outside. What is really interesting – most people do not notice or understand the purpose of the button, though it is the single visible button, and it really contrasts with environment.
Anyway, military academy training proved to be successful, instead of calling me or climbing over the fence (that would be too childish), more sophisticated approach was used: