Joey Tribbiani, Chandler Bing, and Ross Gellar ordered a large pizza for Monica who was about to reach home from a hectic office day.
When Monica reached home, she found that pizza was eaten by someone.

When she asked all three about the pizza, Ross told that Chandler has eaten the pizza. Joey and Ross also gave a statement to Monica which I am not disclosing here.

Later on, it was observed that only the guilty person gave the correct statement.

Who ate the pizza?

Friends Riddle

Harry Potter

Explanation:
If Ron had stolen the car, he must be telling the truth, which cannot be the case since he claimed Hermione stole the car. So Ron is lying, which results Hermione did not steal the car.