Mark 8:22-26 (ESV):
And they came to Bethsaida. And some people brought to him a blind man and begged him to touch him. And he took the blind man by the hand and led him out of the village, and when he had spit on his eyes and laid his hands on him, he asked him, “Do you see anything?” And he looked up and said, “I see people, but they look like trees, walking.” Then Jesus laid his hands on his eyes again; and he opened his eyes, his sight was restored, and he saw everything clearly. And he sent him to his home, saying, “Do not even enter the village.”
This is a fascinating healing story. For one, the first healing didn't "take" so Jesus had to lay hands on the man's eyes a second time. For another, the man makes a strange comment about seeing people that look like trees walking. Finally, Jesus sends the man home immediately for some reason.