There's a public pantry in one's office that has a shared refrigerator. Someone opens the fridge and sees a container of milk that is usually not there. He asks a co-worker if he can use it and he says, "I saw someone in HR put it there, yesterday and he said it's leftover, anyone can use it." So, the other person helps himself to some milk.
Later in the day, the 2nd person discovers that no one from HR had allowed anyone to take that milk. You discover that the person accidentally lied to you because he misunderstood what the HR person had told him, which was "You can use it" and that meant, just him. But he understood it to mean "anyone can use it."
Now that the milk was taken, who is responsible to pay for it - the person who accidentally "lied", the 2nd person, both, no one because it was accidental?