That surprises me
A phrase borrowed from the movie "Dinner for Schmucks". It is used in a sarcastic, mocking manner after asking someone a ridiculous question.
Example:
Dude: Have you ever lived among Alaskans and ate bear meat in their traditional manner?
Dudette: No!
Dude: That surprises me...
Dude: Have you ever lived among Alaskans and ate bear meat in their traditional manner?
Dudette: No!
Dude: That surprises me...