J.
Although I am a plumber/bathroom fitter, one of my phobias is waste pipes. I can cope with the usual above ground stuff but I really don't like below ground drainage. I have trouble lifting a manhole cover and don't like looking down a floor drain or gulley. My biggest nightmare would be walking through a large sewer pipe.
Well that is my fascination
I love that side of plumbing, though it's generally covered by builders. In fact if I hadn't signed up for a plumbing apprenticeship I would've gone with my M8 on JCB driving . I like spiders too - I trained one to walk where I wanted it to