As the class is getting ready to be dismissed:
Jim: Hey! What are you doing? Geez, that's so gay!
John: Ewww. Really. You're a retard.
Me: Hey! I don't want to hear those two words again! Seriously!
John: Um, which two words?
Me: What? "Gay and retard."
John: Oh. We said "nipple" too.
Me (thinking): Nipple is fine. No problem at all with nipple.
Jim: Really? Nipple's okay? Oh. Okay.
Me: Yup. You can use "nipple" all you want. Just don't call each other gay and retard anymore.
John: Jim is such a nipple.
Me: Much better. Go to lunch now.