Wendy Testaburger is the most pomimently featured female student of South Park elementary... and with good reason! Wendy is Stan's girlfriend and often in strong opposition of Cartman. Wendy is featured less and less as the seasons go on, but the infamous bit at the start was Stan puking on her.
Cartman: Ha! I'm not giving a dollar to those towel-heads!
Ms. Choksondik: Eric, the Afghan people need our help!
Cartman: Oh, I'm sorry, but I thought we're at war with these assholes!
Wendy: We're at war with terrorists, fat-ass, not with Afghanistan! And the reason you'd care is so you don't give them a dollar!
Cartman: (stands up) That dollar buys me a chocolate milk for lunch! What, you want me to get a regular milk for 50 cents?? Now look... It's not our fault that terrorists hate us; we're just kids. We're not the one's dropping bombs on them; we're just caught in the middle. It's not our fault.
Wendy: The Afghan people are caught in the middle, too.
Cartman: Yes, but they're sand-monkeys!
Ms. Choksondik: Alright, children, settle down! We're all sending dollars to the children of Afghanistan, that's it, end of discussion!
Cartman: (sits down) GODDAMMIT, I HATE REGULAR MILK!!!