A comms engineer was called out in the middle of the night. His normally mild boss surprised him by saying "Get down to ..... quick - their comms is in the sh*t. When he arrived he discovered that the building maintenance had been trying to clear a blockage in the toilets. After trying various caustic substances to no avail they used a drain rod. After much pushing there was a sudden movement of the obstruction. They flushed the pipe and went home - job done.
Meanwhile in the comms room on the floor below a hazardous mess worthy of an episode of Doomwatch** was spreading over the modem racks and dripping onto the floor - from the now uncoupled 4" plastic waste pipe in the false ceiling void.
**Doomwatch was a TV drama series about the unexpected dangers to the environment. Everyone of a certain age remembers the plastic eating bacteria that escaped from a research lab.