12 I See What You Did There
A reference that got its start on TV (Friends, of all places), I See What You Did There is a sometimes clever, sometimes condescending way to tell someone you know what they did.
“You told the head cheerleader you might go out with her if she were as pretty as the girls on the flag team? I see what you did there.”
Or “You took the Power Point slides from lecture and tried to sell them to me as ‘your notes’? I see what you did there.”