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Over the weekend I have had the theme for the song 'Supercalifragilisticexpialidocious' going through my head on an endless incomplete loop. I don't know how it got in there - I haven't seen Mary Poppins since I was about six and I never was a great fan of musicals anyway. I don't even know the words, which is really annoying because I get little snippets intruding into my otherwise well-ordered thoughts. Words like 'atrocious' and 'precocious'.

Normally when a song is stuck in my head on a loop, I can get rid of it by letting it play itself out - or by drowning it in something loud. That hasn't worked this time, so I'm going to have to drill a hole in my head to let it out.