Only a slight exaggeration, honest. I was doing some noisy music practice in a spare bedroom (detached cottage) and the vibrations seem to stirred the beast.
It is a quaint cottage, 500+ years old, not a level floor or perpendicular wall to be seen. We have been telling DS2 not to worry about spiders, so I feel especially ashamed about my cowardice but it was huge. I am also seeing nooks and crannies everywhere and probably won't sleep tonight, as the room in question is an annex to our bedroom. The bottom of the beam in the pic is about 6" wide.