the lady doth protest too much, methinks

Used to indicate that someone (not necessarily a woman) is only denying something so fervently because the opposite is actually true. A line from Shakespeare's Hamlet, Act III, Scene ii. A: "No, I already told you, I do not like Tom in that way! We have nothing in common! There's no way we would be romantically suited to one another!" B: "Hmm, methinks the lady doth protest too much." A: "Shut up, I do not like Dungeons and Dragons! I'm no nerd!" B: "Haha, chill out, dude. It's not that big a deal." C: "Seriously, the lady doth protest too much, methinks."