Tunes
No not the throat lozenges, the ones that pop in your head for no reason. I have two standard tunes that, with no prompting or invitation, start playing over and over in my head.
1. Mac the Knife – Sinatra version.
2. Star Spangled Banner – not the Hendrix version unfortunately.

Why?

In a similar vein I also have the weird ability to morph one tune into another. Currently the Muppet theme tune (It’s time to play the music, it’s time to light the lights… or however it goes…) easily slides into Santa Claus is coming to town (he knows when you are sleeping, he knows when wide awake…). I think it’s the bridge in the Muppet theme tune that throws me, I’m not sure what follows it, so my brain substitutes a festive ditty instead.

This is all mildly worrying you know…