When I originally wrote the lyrics to "Don't Mix Your Drinks" they began:
In every supermarket there's a most delicious drink,
In corner shops, off-licences and any pub you think...
It really bugged me. It should have been "any pub you think of", but I couldn't find a way of getting the rhyming and scansion to work. Eventually I dropped the off-licences and it became "in every corner shop and any pub of which you think", which maybe sounds a bit formal but is at least correct English!
This put me in mind of those occasions where, for reasons of rhyme or scansion, a lyricist has accidentally turned grammatical English into nonsense. For me the classic example is at the beginning of Sandie Shaw's 1967 Eurovision winner "Puppet on a String" (lyrics by Bill Martin, music by Phil Coulter):
I wonder if one day that you'll say that you care...
It should be "I wonder if one day you'll say that you care" - the first "that" is redundant. Any more like this?