Christian Slater gives an amazing performance as Clarence, so too does Patricia Arquette as Alabama.
Through out the movie, there are epic individual battles between Slater & Gary Oldman. Christopher Walken & Dennis Hopper. The late James Gandolfini(RIP) & Arquette, not to mention the epic finale to this masterpiece. And the awesome short scenes between Slater & Val Kilmer, who plays Slater's imaginary friend, who is none other than the King himself, Elvis Presley.
I am giving nothing away as it would be an injustice to anyone that has not seen it, my advice is, go watch this movie immediately. I swear that you will not regret it.
Easily the easiest 10 out of 10 there has ever been.