Lost, not necessarily in Translation

Mom calls (again):

Mom: Hi! I forgot to tell you (jumble of words) crunch!

Me: What's that? I didn't understand you.

Mom: Crunch! Crunch!

Me: What does that mean? What are you talking about?

Mom: Crunch! Crunch! You used to like chocolate krispie!

Me: Oh, no thank you.

Mom: What, no thank you? What does that mean?
Me: It means no, I do not need it.

Mom: Why? I bought it for your students.

Me: You already bought it? What are you saying? Will you speak in whole sentences? I don't know what you're asking.

Mom: Crunch! Kit Kat! Crunch!

Me: Mom! Complete sentences! I don't know what you're asking.

Mom: (louder) CRUNCH! KIT KAT!

Me: Do you already have the Crunch and Kit Kat?

Mom: Yes.

Me: Oh, okay then. Thank you. I didn't realize you already had it.

Mom: What should have I said? Teach me.

Me: You should have said, "I bought some chocolate for your students. Make sure to take it with you when you come home." and I would have said, "Thank you."

Mom: Ohh...now I know.

Me: I'm sweating.