Reminds me of an apartment I used to live in where there was a completely open wifi with an open and shared RW hard drive from the root on the network. I left them a post it note and slipped a card under the door a week or so later without them making any change. Finally printed their resume to their own printer with added massive text in the middle saying something like “for your sake you need to stop sharing everything in the network!”

It was gone within a day. In my head they unplugged it all in a panic. =)