What surprises does the speaker meet with when he carries out sam McGee's request?

When the speaker fulfills Sam McGee's request to cremate him, he is surprised by the eerie and intense experience of performing the task in the frigid wilderness. As he works to build the fire, he is haunted by memories of Sam and the strange reality of his friend's unusual request. Ultimately, the moment takes an unexpected turn as he discovers Sam's body in the cabin, which appears alive and animated, adding a surreal twist to the fulfillment of his promise. This culmination blends elements of shock, grief, and the supernatural.