Hearing one of your favourite bands on one of your favourite TV shows, like when I heard "Keep it Clean" by Camera Obscura on Skins last night. (Or, indeed, when they were on Gilmore Girls.)
Sadness is when you realise they were saying something mean about that song and the kinds of people who listen to it.
Bad Skins writers. Unfortunately, short of bitching about it here, my only other form of protest is not to watch the show any more, and *that* is unlikely. So I'll just sit here and stew.