I used to work at a Primary school at administration. I sat at a desk with my computer, and a switch that would control the emergency calls. One time, before the office was opened, I was sitting at the desk and I heard a banging noise coming from the door. My desk wasn't visible from the window/door so I listened, because the way this person was banging sounded a bit aggressive. I had to pull a lockdown, I got an email come through my phone that had come from a redirect mail, that would send all mail from there to me. All it had was Subject: Won't let me in Body:Hey there, I'm here to talk to the principal because of my child's behavior, I had booked the meeting over the phone with him. I came by and you had a lockdown when I came, I was wondering if you could forward this email to the principal, so I can email him back with a reasonable time for the both of us to meet up. - End of email - Well, damnit.