With the end of the Doctor Who DVD range in sight (by the end of this year, all of the extant episodes bar one will have been released...well, unless you believe the rumour that a metric f***ton of episodes have been found somewhere overseas, and frankly I don't), some of the earlier releases are being re-issued in special editions with extra special features and improved picture quality. One such re-issue is Inferno, Jon Pertwee's fourth serial. If you haven't see it, I recommend the story anyway because it's wonderful, and if you have the original DVD, I recommend an upgrade because quite frankly those bods at the Doctor Who Restoration Team have got it looking absolutely marvellous.
When I replace old discs, sometimes the originals are, well, just plain normal, so they go in the charity shop pile. Sometimes, though, Sarah or I have got them signed at conventions, signings, events, etc., and so we keep the originals (but up in the attic to save space in the lounge).
When I looked at our original copy of Inferno, I realised we'd be keeping it because it has, indeed, been signed.
And I got a bit unhappy because of who had signed it, and the fact that they're no longer with us.