Or you know, let’s not because it’s annoying.
“Gotcha” is a conversational gambit where you prove you know more about a subject in such a way that your conversational partner
will want to kill you will be embarrassed. To be
fair, you might not have intended to embarrass them! It might be that you just
wanted to impress them with your depth of knowledge. Of course, it is equally
possible you might just be a jerk.