French phrase
Vous plaisantez !
Meaning
You must be joking!
When to use it
Expresses disbelief or strong surprise. It is somewhat polite but emphatic, often reacting to an unbelievable statement or price.
Example dialogue
C'est 200 euros la nuit.
It's 200 euros a night.
Vous plaisantez ! 200 euros ?
You must be joking! 200 euros?