What was your first clue?

What was your first clue?

A rhetorical question used to point out the obviousness of some conclusion. A: "I think something is wrong with the engine." B: "Oh really, what was your first clue? The smoke pouring out of it?"
See also: first, what
Farlex Dictionary of Idioms.
See also:
  • Does (one) look like (something)?
  • you think
  • How (something) can you be?
  • How (something) can you get?
  • how selfish, stupid, ungrateful, etc. can you get?
  • selfish
  • ungrateful
  • Do bears crap in the woods?
  • Does a bear crap in the woods?