When I get ready for work each morning, I watch channel 2 news. Just before I leave, there is an advertisement for a soap opera. I don't even know which one. But it has the catchiest jingle. The last 2 lines of the song say: "Two can keep a secret, as long as one of them is dead." Then it shows a woman underwater staring at you.
I have been singing that song in my head for the past 3 days. No matter what other song I try and sing, that one comes right out. Jingle writers are very creative and talented. Wish I could create one so I could sing a different tune.