music, memetic hazards, mutualistic thought-organisms (++)
I have an absolutely ferocious earworm and NOTHING is coaxing it out of my head.
OTOH, the earworm is of the species Mybloodyvalentinus Whenyousleepii (https://www.youtube.com/watch?v=l9-NOIalUYU), blessed with the DNA of the prettiest guitar noise ever, so I'm actually rather pleased to have the little critter in here.
So I'm going to avoid all ad jingles and catchy pop songs for the next couple days so it can live a good full healthy lifecycle.
Would you like one of your own? Dee deet doo doo, doot dee doo doo, *etherial warble*...