A song that is unique to every individual - a song that speaks about your personality and makes you want to get your groove on. Yes, I said get your groove on. A particular theme song is one that makes the person feel amazing when it is played.

The horrible moment when you realise that you have accidentally done something very slightly wrong which has very bad (usually embarassing) implications for you. This is typically the moment of realisation that you just sent a dirty text message to a close member of family, typically your mother, rather than the intended recipient.

Things that exist or were invented or created at different times by different people but none-the-less, go perfectly together.

The only worthwhile part of an otherwise-boring radio/TV show, especially for younger audiences.