We have recently upgraded our cable TV system to allow easier recording, live pause and rewind. It's great when there's an interruption but means one ends up recording a lot of stuff that would otherwise have been cheerfully missed. I like to record what I call classic TV but what my wife refers to as some old crap you've seen before. This includes the original Star Trek and other greats such as The Champions.
Anyway, last Sunday I watched two totally unrelated programmes that I'd happened to record, an episode of Columbo and one of Star Trek. Both had the same title, Dagger of the Mind, a line from Shakespeare's Macbeth. The Columbo was a nice one as it was set in London, not far from where I used to work in Sloane Square, and concerned the death of a theatre producer preparing for a new production of Macbeth. The Star Trek episode had a less tenuous link - it concerned a high-security prison/asylum where Kirk is subjected to a mind altering treatment. The connection is more apparent if you look at the continuation of the quote:
A dagger of the mind, a false creation,
Proceeding from the heat-oppressed brain?
A good description of how Kirk is affected by the Neural Neutralizer.
How's that for a coincidence?