Coversations with Sian's Lame Exchange Friends

On the way to bus stop on Friday I decided I was going to sit out on yet another International Students thing as my bowels were doing backflips.

Kai: Aw, don't go! You should come out with us! What if you come but don't drink?

Me: What's the point in going out if I don't drink??

...silence...

Liza: Do you really believe you can't have fun unless you're drinking?

Me:....nooooo.....I was jooooooking.......

What is she? My health teacher from year 9?