Cheaters and Spoilers

No one gets hurt... 
Radiohead 

After my first experience as a sentinel during a test, I suddenly realize how poor many of the attempts to cheat and/or communicate are (including mine, of course). Here's what I learned (at your risk).

1. If you act weirdly you definitely get caught after seconds. Do not: look at your friend, stare at the sky, nervously cross your legs, and so on. Do not whisper. Do not be stupid.
2. Instead, if you need help from your friend sitting next to you, be smart enough to define a symbolic language before the exam. Make it evident that you're asking for a rubber, then replace "have a rubber?" with "capital of India?". Your smart friend nods and says "New Delhi". No one gets hurt. You get your answer seamlessly. Even too easy.

Changing the subject, cool stuff was published today! Enjoy the spoiler below, then go here for details. Ciao :)

(Caidagram example)