ID this jingle/TV show theme/video game theme?/??? from this whistling.

I’ve been whistling this uncontrollably for a week and I can’t remember what it’s from. It has the feeling of a sixties TV show theme, or possibly a Mario-era video game. In my mind, the original is played on a fruity sixties organ, but that might not be the case.

Have at it!

Is it the theme from Pot Black?