I too do this now, and I learned it from the movie The Long Kiss Goodnight, wherein Samuel L. Jackon's character, in order to remember where he puts things (and

I too do this now, and I learned it from the movie The Long Kiss Goodnight, wherein Samuel L. Jackon's character, in order to remember where he puts things (and as a pretty clever plot device), sings it as he's doing it in a blues riff.