Oh wow.. I just had my much-needed hysterical laugh for the day. I'm utterly amazed that someone would put bullets in their ears. Although, to tell the truth, bullets would have been my suggestion long before twigs and spark plugs. And at least it's fairly easy to come up with an excuse for putting bullets in your ears. Much easier than, say, trying to explain why they're stuck up your nose... although there would be some lubrication there, and the bullets would be less likely to get stuck. Or, you could get a bullet stuck up your a** - but the probablity of those getting stuck is low, as well. That would provide us all with a new way to fire bullets, though.. And would be much cheaper than having to buy the weapon. :)
I wish you the best of luck in getting the silly things outta your head.