1) Answer to a stupid question 2) Blank reply 3) Brain fart response 4) Cry with a head slap 5) Doltish interjection 6) Dopey comment 7) Dumb reply 8) Gee, ya think 9) Head-slapping utterance 10) Head-slapping word 11) No shit, Sherlock 12) Response to the obvious 13) Retort to a no-brainer 14) Sarcastic response