Someone notices Regulus singing a song nonstop and when they ask him what song it is he just says he doesn’t know and walks away.
And then like a month later the song comes out on the radio and that person is just losing their shit.
Seer! Regulus but it only allows him to randomly know songs (mostly muggle) that have yet to be written. Like imagine he goes to to Lucius and Narcissa's wedding and just starts humming 'Barbie Girl' by Aqua.
Sirius pisses him off and so Regulus screams 'Who let the dogs out' at the top of his lungs.
11 year old Reg just strolls down the Hallways singing Mr Blue Sky. (On bad days it's A Thousand miles by Vanessa Carlton)
regulus vs the divination professor