Was listening to the Twin Peaks theme, when I found myself singing 'the locomation'! It seems to fit quite well. Can anyone think of others? I'm sure the pet shop boys had a song that segued into somebody elses song quite well. It might have been when they did a cover of U2's where the streets have no name and it turned into 'oh pretty baby, and if its quite alright I love you baby' (whatever song that is). I could have just made that up, I'm not sure.