Random. I was listening to 'Say My Name' from the Beetlejuice musical... and at one point when they were song-arguing there was a short part where it sounded like Lydia and Beetlejuice might be singing the same melody - except him in major and her in minor. And he lilted down on the last note of a few phrases while she was tending to lilt up, further emphasising their disagreement.
I have no idea if the up and down was by a full note or just sharp and flat, and the sheet music seems to be paywalled to get the second page so I can't even try to puzzle that note out.
I don't know much about music theory and can't really read sheet music. Sometimes my brain just decides to have shower thoughts