Quote Originally Posted by Lesleyp
Actually...It's very proper to say: Look me in the eyes

Apparently, some people do say "look me in the eyes". I stand corrected.

I don't usually hear people say it that way, but a Google search shows that it is used that way fairly often. Not as often as with a singular 'eye' (3 to 1), but still quite often.

I imagine nobody would notice if you used one or the other.