When I was 10 years old, all kids at my school got access to school emails. The email address book contained everything in my city, like fire department, all pupils of all schools etc. So I decided to "test" the system by sending out a mass email to everyone in the address book (about 3k) with the question "Hi, how are you?".

The sys admins apparently didn't think very far as I got some responses saying like "You have crashed a server in the capital city" and "I have contacted your local IT admin".

So I went to the IT admin and told him the situation. His face turned red of anger and I remember him almost screaming at me.

Who the fuck doesn't set up protection for this and gives out access to 10 year olds? This was 15 years ago, I really hope sys admins are smarter today!