It's on a neverending reel, it's in my head

I think we have all had this happen. Unually it is a good song, typically the last song you listened to before you started work for the day or whatever. Sometimes it is a bad one. I once had Mightnight Maniac by Krokus stuck in my head for nearly 2 weeks. It was a horrible nightmare. Sure other song would pop in there, but Krokus would soon take over. I think I heard it on one of the 'metal moments' cd commercials. A few weeks ago my friend and I both had Hold on Loosely by .38 Special. Mainly just the guitar solo bit. When everyone is playing together. Neither of these songs were welcomed by me. They just came and stayed too long.So, tell me the time when you had an undesired song stuck in your head.