Q-sniped
You're hoping to get out of answering, but the teacher decides to make your life a misery. You or your friend gets called on, and you're all doomed. That's Q-sniped, and it's the worst kind of torture.
My teacher called on me after I said I didn't know. I had to explain it.
My friend got called on and said he didn't know. He was humiliated.
My teacher started a chain of Q-snipes and I got stuck in the middle.