The last song that I think of or hear gets stuck in there pretty good. Don't you hate it when it's that terrible 'circular' tune that you hear when you're placed on 'hold' on the phone?
it keeps itself there until i find the reason, the origin of it (normally, serves as a reminder of something i had forgotten) :)
I can be stuck for weeks at a time. I will just get comfortable, then the ear worm crawls back in. Currently, it is I've Gotta Get a Message to You, by the Bee Gees. It has been nearly 2 weeks.
Oh yes, so can I...for about 5 minutes. Then the worm returns. I am fine, as long as I am doing or thinking anything else, but as soon as my mind relaxes, it comes back again.