1. The teacher asks you to answer a question that you have absolutely no idea how to answer
2. You say something that sounds really smart and that pertains to the subject at hand, though it does not answer the question at all, and discreetly direct the teacher's attention to a fellow classmate (this can be through mentioning their name, pretending that you are partners, or a not-so-discreet glance)
3. The teacher thinks that you have done your part, and now is focused on the unsuspecting victim
Here is an example:
Teacher: Bill, could you tell me what you and your partner thought about the discussion board?
(Bill had no partner during the dialogue, was half asleep, and didn't even realize that the class had done anything)
Bill: Yeah, we talked about how it seemed like a very difficult subject filled with complexities, didn't we Bryce?
(Bryce is unwilling to make you seem like a liar in front of the entire class so he goes with the flow. The teacher is now staring at him intently, waiting for him to expand upon the subject)
Bryce: Uh, yeah. (glances at Bill) It was definitely a loaded topic. There are certainly a lot of different views one could take on the subject, and it's really hard to see things in black and white here...
Teacher: Yes, but Bryce could you be more specific?
Bryce: Uh, no ma'am. I didn't read the chapter.
(condescending glance from the teacher)