It is creepy to stand too close and stare.
John looks out of the window and notices his neighbor is burning something in the backyard.
John wants to find out what his neighbor is doing.
John takes a picture of his neighbor with his cellphone and zooms in what they are doing.
John immediately goes to his neighbor's open backyard so that he can see it more clearly.
His neighbor is undisturbed by John and continues with the activity.
His neighbor feels offended and asks John to leave his backyard.