What are the worst movie songs ever?

Not many rules but if you really hate "We've only just begun" because it isn't Metal Rap, I don't think it would qualify.

For me Queen's "We Are The Champions." in "Knight's Tale" set my teeth on edge because it is so out of place.

Second place would be the "Oom-pa-loompa" song from Gene Wilders "Willy Wonka & the Chocolate Factory". There's something about hundreds of dwarfs with identical faces singing it that just creeps me out.