I blogged a while ago (here) about some problems in our student residences. I thought I would provide some pictures of a fault when went to this week.
The student was reporting intermittent network connectivity issues but when we tried to find problem we couldn't replicate the issues she was having... until the flat upstairs turned their water on.
It turns out that there was a leak and this was filling the riser, where some stupid architect thought it would be a good idea to have sockets, with water.
The socket and cable was dripping and, as you can see from the pictures, black, rusty and full of water.
Informing the building owners, apparently this is a common issue.