I can't even start to mention the stuff DBH hoards, I am not allowed to touch it. We have several old computers, tvs, printers, speakers, radios, DVD players, video recorders - none working. Lightbulbs of the old sort that don't even fit our lights. Board games the kids didn't like, but he did when young and refuses to part with them. LOADS of them. Old sports equipment - really ancient tennis racquets that are too heavy, ancient golf clubs. His study outside has racks to the ceiling full of the crap stuff. As for cables - they have spilled over into poor DS's music room/den.
As for his shed - well, you can barely get in it, and it's meant to be a working space. But no piece of wood, no matter how small, has ever been allowed to leave the premises because 'one day it might come in useful'. On the rare occasions when he does find a use for a piece, he crows about it endlessly, but more often than not he surveys what looks like the beginnings of a very large municipal bonfire, and trots off to buy a new bit.
I have to throw out all my old coffee jars before he can lay his hands on them, because he is using them to keep nails and screws in. Old ones, not new ones. Sorted into different lengths and thicknesses. However - last week he went out and bought a whole load of new ones.