“That’s unfair!” said Daphne. “No, it’s science,” said her father. “‘Could have’ isn’t good enough. Nor is… — Terry Pratchett

“That’s unfair!” said Daphne.

“No, it’s science,” said her father. “‘Could have’ isn’t good enough. Nor is ‘might have’! ‘Did’ is the trick.”

p. 335Source: Wikiquote · CC BY-SA 4.0