Rage of the Heart, definitely. That's such a bad concept, with such tragic casting. Michael Ball as Abelard? Anything with lyrics like" "I demand a phallus of flame, eternally rising, that never goes lame" is just wrong, but amusingly so.
I'm not sure if Paris counts, but Greek Kings rocking out like an 80s hair band? What's not to love?
'"Contrairiwise," continued Tweedledee, "if it was so, it might be; and if it were so, it would be; but as it isn't, it ain't. That's logic."'
~Lewis Carroll