Spooks is possibly the only show I watch that can have me be "meh" about its new season (seeing as its an almost entirely new cast and they have that regrettable habit of killing of my favourite characters) and then, by the end of the ep, be sitting bolt upright in front of the tv going:
WHAT IN THE FRICKETY FRACK IS THIS?!?!?!?
Show, I love you. Don't ever change.
(Except for, yanno, the killing off of favourite characters thing. You REALLY need to be stopping that.)