It's just amazing what's stuck in the back of your brain, waiting to be coaxed out by a few musical notes.
My kid plays this tune from the video game Deltarune today:
https://music.youtube.com/watch?v=XH1ibcc_MpQ&si=y7gDPB8YDE-b4ORw
And I'm instantly humming the demo tune from the ancient Casio VL-TONE keyboard that my sister owned back in about 1985.