Use the quote, "No, I will not pretend to be a duck and quack in public!"
"No Sirius! I'm not doing that! It's absolutely insane, why would I make a fool out of myself just for your benefit?" Lily Evans screamed at Sirius Black for the umpteenth time that day. All day Sirius had been bugging her to do something wild. He had said that she was too serious lately-his pun intended- and that she need to have some fun. Lily still refused to do what she was saying, she had N.E.W.T. testing coming up in a few weeks after all, and she wanted to do good on them.
"Come on Lil! James hasn't been doing much lately because he's been studying with you because that's all you do lately and he wants to be with you. If you do this, maybe James will lighten up a little. It's weird seeing him like this," Sirius finished his rant to see Lily smiling. She was thinking about her boyfriend wanting to study just so he could spend time with her. That's sweet of him, Lily thought. "Lily, please!" Sirius begged Lily, effectively snapping her out of her thoughts.
"Sirius! For the last time, no, I will not pretend to be a duck and quack in public!" Lily snapped as James came up to them.
"Sirius, you've got to be kidding me, there is absolutely no way she'll do that. But I will if you do!" James said his tone turning from serious to joking. Sirius agreed and they both proceeded to act like ducks and quack at people who passed by them in the corridors. Lily faced palmed, her boyfriend was an idiot.