Cool, the old 2007 thread that refuses to die...
My favorite cable story was the time when I owned the little music store.
This bass player came in and wanted to look at new basses because he said his Mexican P Bass sounded terrible.
He asked if he could possibly trade it in. So I took it out of the case and plugged it into a bass amp and it sounded like a P bass, just fine. He said wow! that sounds great! What did you do? Is it the Bass amp?
I looked down at the case and noticed a coily patch cord. I swapped it out for the cable I had used and, that's right, the bass sounded dull and muddy. He had been using that old coily cord since as long as he could remember and had been through a few new basses searching for a good tone.
Cables most certainly can be capacitors.