"Burn in" Are you serious?

I got a pair of cherry silver cables (0.5m), and there was downright _sibilance_ when I first listened to them. After burning them in, the sibilance went away, and the cables overall became smoother, although still missing a little bottom end. That's when I stopped being a skeptic.

BTW, in my above post, I did not listen to my cables while I burned them in, so there is no way that I got used to them. I listened to them, flinched, disconnected them, used other cables while I connected mine to device I have that generates pink noise for several days, put them back in, and did not flinch.