What Is an Example of Foreshadowing in "Of Mice and Men"?

One example of foreshadowing in "Of Mice and Men" is in the beginning, when Lennie is holding and stroking a dead mouse. This scene is foreshadowing the climatic event near the end of the novel, when Lennie accidentally kills Curley's wife. "Of Mice and Men" is full of foreshadowing of this event.