Ode to a father

When I was little, my dad used to sing a lot. He would sing songs to himself while he was washing the dishes or walking me to preschool; any number of things, really. Most of the time he didn't know all the words, so he would make them up. I've been thinking a lot lately about a song that he made up about mayonnaise. It was set to the tune of Nat King Cole's "Mona Lisa." But because Mona Lisa has 4 syllables and mayonnaise only has 3, he added a fourth at the end. So the song began: "Mayo-nnaise-a, mayo-nnaise-a, mayo-nnaise-a..." and then, because nothing rhymes with mayonnaise (much less mayonnaise-a), the next line became "do-de-do-de-do-de-do-de-do-de-do." I don't know why it's been in my mind lately, but I've been singing it to myself while reading for class, grading papers; any number of things, really.