In John Steinbeck’s “Of Mice and Men,” George Milton stops playing tricks on Lennie Small primarily due to a pivotal incident that underscores the seriousness of their relationship and George’s responsibility as Lennie’s caretaker. One notable event occurs when George instructs Lennie to jump into a river, unaware that Lennie cannot swim. This prank nearly results in Lennie drowning, prompting George to realize the potential consequences of his actions. Feeling guilty and recognizing the need to protect Lennie, George decides to prioritize his friend’s safety and well-being over any further playful antics.

This shift marks a significant turning point in their relationship, as George becomes more focused on ensuring Lennie’s welfare rather than indulging in jokes at his expense. As their bond deepens, George’s care for Lennie evolves into a genuine commitment to safeguarding him from harm, ultimately leading him to abandon the practice of playing tricks altogether.

Evidence for this can be found in George’s reaction to the river incident. After rescuing Lennie, he expresses remorse and acknowledges the gravity of the situation, saying, “I done a real bad thing. I shouldn’t of did that.” This demonstrates George’s realization of the potential danger his pranks pose to Lennie and his subsequent decision to change his behavior.

Furthermore, George’s decision to prioritize Lennie’s safety is highlighted in his conversation with Slim, where he reflects on the incident and vows to take better care of Lennie. He states, “I won’t do it no more. I’ll tell you what I’ll do… I’ll take him to a booby hatch.” This indicates George’s commitment to ensuring Lennie’s well-being and seeking professional help if necessary, rather than engaging in further risky behavior.

Overall, these quotes provide evidence of George’s recognition of the seriousness of the situation and his decision to stop playing tricks on Lennie out of concern for his friend’s safety and welfare.