Openness index Puns

So my wife is learning sign language in college and will come home excited about all the stuff she has learned and will try to teach me. The only thing I've retained so far is yes and no. So when I ask her something that she wants to say no to, she'll sign it (thumb, index, and middle finger spread out, and then closing, like squishing a bug). I'll reply to this with just the opposite, opening those three fingers. That is not the correct sign for yes, the correct sign is like knocking on a door. Well when she does that to correct me, I yell "Who's there?!"

She's going to divorce, I just know it.