The Germans have a great word for a tune that you cannot shake. "Ohrwurm" or earworm which gets stuck in your head. In this case it's not the last piece of music I heard on the radio before leaving home, it was a radio advert for Shop Small UK, the excellent initiative from American Express which encourages people to only shop in local stores on Saturday 6th December. This is the advert here - the radio version is the same.
[embed]https://www.youtube.com/watch?v=kfUBY12OaYE[/embed]
Once you've listened to this then listen to this advert from British Airways back in 2011.
[embed]https://www.youtube.com/watch?v=XozHLoqwp_4[/embed]
I've not had time to research the creative source of either advert but the similarities are quite marked.