There best be a flush knob disguised as a recliner level on the other side.
From the submitter:
When our sink started leaking the landlord came and pulled the boards out and left us with a bucket that filled in 2-3 hours. Pictured was was our solution to stop the water flooding through the floor overnight. Yes, we were students. No, we didn't know you could turn a tap and switch the main water off.
I'm just gonna let that last sentence sink in.