Revenge of the Cybermen (TV story)

Cyberman in The Moonbase: Revenge? What is that? [...] Feeling? Feeling? Yes, we know of this weakness of yours. We are fortunate. We do not possess feelings.

Twelfth season closing serial title: Revenge of the Cybermen

I guess in between times the cybers got a Cyber OS upgrade that included both a sensitivity to the feeling of revenge and a patch for the nail varnish vulnerability. Shame it came with a gold fallibility glitch. Oh and the batteries now drain really fast as well...