Uncle Vernon: And what the ruddy hell are dementors?
Aunt Petunia: They guard the wizard prison.
Harry: How do you know that?
Aunt Petunia: I heard that awful boy telling her about them years ago.
Harry: If you mean my mom and dad why don’t you use their names?
That moment when you realize Petunia’s talking about Severus Snape and not James Potter…