If you want to bring some joy into your life, sing a silly song. Sing it in the shower or sing at your desk or even sing it just in your head.
You can't help but find some joy in its words and its catchy tune.
One of my favorites is "Who Put the Bomp," by Barry Mann, a 1961 hit that with joyous humor, made fun of other silly songs from that year.
It always makes me smile, as your favorite silly songs will make you smile.