Warning: scum alert
I have a pair of sunglasses. They're cheap and they have a crack in the middle of one of the lenses. Both glasses arms are also very chewed - by someone else, and later, to a lesser extent, by me.
I found these glasses on my hall table sometime in the last year and a half and have been using them all the time since. They're my favourite shades. I think they belonged to my niece but I never verified this fact so they could have come from anywhere. Maybe a fairy left them for me.
Anyway, a few weeks into me wearing them I met up with a society-conscious, normal-female-type friend. After a while she noticed my glasses and asked to try them on. But upon closer inspection she noticed in horror the very mutilated arms on them. I opened my mouth to explain that the chewing wasn't actually done by me. But stopped myself in time when I realised that it's probably a far worse grooming crime to wear glasses chewed by another rather than have chewed them myself.
I think I made the right decision.