Cables of all shapes and kinds. RCA to XLR, 1/4 inch to XLR unbalanced, mini plug to RCA, and other interesting adapters; headphone extension cords of dubious quality; a misplaced microphone cable; a bunch of XLR to XLR patch cables that are a complete mystery as to why I've got them; several MIDI cables that would have been handy about three months ago when I ended up going out and buying more MIDI cables; a four channel RCA to 1/4 inch cable snake; power cords; and a whole bunch of computer cables of one kind or another.
And RCA cables. Billions and billions of RCA cables.
I think I will not need to buy another RCA cable for the rest of my life.
If only I can find these when I need them.