For me, it’s as simple (and as cruel) as getting the song stuck in someone else’s head. I’ll start singing it, and as soon as they murmur a few of the notes it’s like sluurrrpp worm is pulled into their ear, out of mine. Not really sure why it works, because that shouldn’t be how it works, but it does…
When no one is within ear-reach, I’ll just scramble the earworm until it dissolves. I’ll start mentally singing little pieces of a whole bunch of songs, whatever comes to mind, never going more than a few lines for each, stopping at irregular times to make it seem less like coherent music and more like miscellaneous sound.