George tells Slim about the incident in Weed. What happened there? How does he explain Lennie’s behaviour?

As a joke George had told Lennie to jump in the river even though he knew Lennie couldn't swim. Lennie almost drowned.

"Jump in.’ An’ he jumps. Couldn’t swim a stroke. He damn near drowned

before we could get him. An’ he was sodamn nice to me for pullin’ him out.

Clean forgot I told him to jump in. Well, I ain’t done nothing like that no more.”