Have you ever had a song stuck in your head?

Not the whole thing, just a bit of it - the hook, say - and that bit just keeps repeating over and over, so that it's the last thing you hear as your head hits the pillow and it's the first thing you hear when the sun peeks through the blinds, and all day it's in there, it just goes 'round and 'round in true cephalic echo-chamber style, over and over, and you can't identify it, oh no, you can't remember where it came from, you think it might've been from a movie but you're not sure, see, that's the thing, you can't be certain, and then after days and days you can feel the pressure behind your eyeballs, building and building, and then you know what needs to be done, oh yes, you've got to do it, got to let that scrap of music out, baby, set that sucker free, and you grab your cordless Makita and slap a quarter-inch bit in there, and you're ready to go, man, got it against your forehead, and you pull the trigger and it pffft does nothing because it's been sitting in your freezing basement for months and the battery's dead, so you slap the other battery in there, the second battery that made it such a deal when you bought it, and you're ready to go and pffft it's dead too, so you stick it in the charger that was also part of the deal and the light goes red and you make yourself some coffee while you wait, and all the while that little musical demon is swirling in your head, circling, a little needle-clawed bastard, and then after half an hour you realize that the battery doesn't really need to be fully charged, does it, so you finish your coffee and yank the battery out of the charger and you slide it into the drill and you put the bit on your third eye, right on there, and you squeeze the trigger and skrrrrrr you left the drill in reverse the last time you used it so it skitters across your face drawing blood but! But! But! You quickly realize your error and you flip that switch and then you go go go, and the drill bores into your face with a smell like burning hair and there's a little pop! as it breaks through the bone and then it slices through the dura mater, the arachnoid, the pia mater and then schlooop it's in your brain! It's in your brain! And you're screaming, "AAAAGGH! BLUAAAGGGG! IT WAS THAT FUCKING SONG FROM 'SHREK'!"

That happens to me a lot, and it's kind of a drag, you know?