The Joke's Over by Ralph Steadman

NYT Book Review:

They met in 1970 on Thompson’s home turf of Louisville, covering the Kentucky Derby on assignment for the short-lived magazine Scanlan’s. Steadman’s drawings — vicious caricatures of local residents, including Thompson’s brother — shocked the writer with their predatory vigor. Thompson, soon to become famous for a similar bloodthirsty tack in prose, demanded of the artist: “Why must you scribble these filthy ravings and in broad daylight too? … This is Kentucky, not skid row. I love these people. They are my friends and you treated them like scum.” Their first collaboration ended with the journalist spraying Steadman from a can of Mace. “We can do without your kind in Kentucky. Now get your bags and get out, and take your rotten drawings with you!”

Isn’t this how all great buddy movies begin?

Here.