last night's funniest moment for me

K: Are you chewing gum? Ooh, can I have some?
K's GF: Sorry it was my last piece!
K: Can I have that piece when you're done with it?
GF: Gross! No!
K: What's the big deal? We share a toothbrush! It's the same thing!
GF: [stops walking] We don't...share a toothbrush. [pause] K, we better not share a toothbrush!