Thanks, Perna and Doh, that made me laugh. Unfortunately, seeing as I'm not a medical or science student, I'm not sure if it would work...and they didn't actually drink any of the milk as far as I could tell...but it'd still be pretty funny.

Anyway, I wrote a note last night saying that whoever did it owes me a new milk, but the only response I got was someone writing "Go away!" (don't know who)...I'm trying not to take this personally.