I don't know whether anyone has mentioned this yet (can't be bothered to read the whole thread), but I hate 'Imagine' by John Lennon - a dreary, dirgy, mawkish statement of the bleedin' obvious!

Also, does anyone remember 'The Man Who Called Himself Jesus' by Dave Cousins of the Strawbs (I think)? The line which goes, something like, "I thought my pint of beer had turned into a pint of blood" takes some beating for poor taste and over-dramatisation! I also found the declamatory, 'I-just-made-this-up-in-the-bath' tune intensely irritating as well.