"Ehm ok, wait here, I ll come up with something else"
"Well... Don't take too long!!.."
Sorry I am enjoying myself here I can sooo picture this conversation hahah
On that note... the list is rather endless. how about "what are you... 5 ?!" frequently seen in comment sections.. And the countless variations on are you stupid or something. wth where you thinking. In traffic: are you blind?. As parents: am I talking to the wall? Or the vague, What where you thinking!