Deface the Music (No, not the Utopia album)...

Inspired by a post in the thread about Bonnie Tyler's Faster than the Speed of Night, where someone suggested the line should have been "Turn around, sweet cheeks" instead of "Turn around, bright eyes." Which made me think...

So, if it was your mission to sabotage a hit or other popular song in one fell swoop, rendering it from chart-topping brilliance to utter, utter crap with one substitution of a key word, phrase, line in the lyrics (or, musical substitution, if that's more appropriate--Black Dog played on mandolin instead of electric guitar?), what would you do?