This play-like structure allowed the work to be quickly adapted to the stage, with the first production mounted on Broadway in 1937, the year of the novel's publication. This production was quite successful, and was directed by the famous playwright George S. Kaufman. The play was revived in 1974 with James Earl Jones in the role of Lennie. Of Mice and Men has also been frequently adapted into cinema - first in 1939, in a production directed by Lewis Milestone (who regularly and skillfully directed adaptations of literary works, including All Quiet on the Western Front (1930)), with Lon Chaney, Jr. and Lennie and Burgess Merideth as George. Most recently the novel was adapted in 1992, with Gary Sinise playing George and John Malkovich in the role of Lennie. This version was well-received by critics and regularly supplements high school English class units on the novel.
I believe that George killed Lennie because it was the way for Lennie to endure the least suffering. Curley was talking about shooting him in the stomach with a shotgun, quite a painful death. George thought that there was no way for them to escape them, and so it was almost already decided that Lennie would die. He could be shot in the belly, lynched, or painlessly shot in the back of the head. That was the way George thought was best for his best friend, and so he shot him. We know that he was not trying to kill him like the rest of the ranch-hands, because he killed Curley's wife, for he told Lennie the story of the farm that they would get, so that Lennie would be in a good place when he died, not scared or in pain. George did a hard thing, although it was the right thing. If I was in this situation I hope that I could be the friend George was and end Lennie's life mercifully.