Sarcasm

Only the most effective way to irritate adults, or any authority figure for that matter. Sarcasm is the use of words or phrases that mean the opposite of the message that you are trying to convey. Also useful for fighting against stupidity, e.g. "you think it's a good idea to go jump that guy but then say hey man it's just a prank". In this situation, sarcasm is the best possible response. You should say, "yeah, right", in the most painfully obvious way as to say that you are joking. This is because, due to sarcasm's rather contradictory and convoluted nature, you automatically get PLAUSIBLE DENIABILITY. The way you use plausible deniability in this context is that if your friend were to get away with it, people might say that you encouraged him by saying "yeah". However, you can claim that you were being sarcastic. On the flipside, however, if your friend were to get stabbed, you would claim sarcasm as to debunk any responsibility for your friend's new injuries. Also commonly used when in a bad mood, to convey that you are upset but unwilling to talk about it, typically accompanied by eye rolling.