But what is the real acid test for you? Here's mine:
Purple - trying to win "I'm the king of the castle" points against you for something that reflects on them. An old boss of mine once tried to get everyone to laugh at my crappy, pauper's car once. There's a reason why it was only once.
Blue - genuinely believing that not being two-faced is more desirable than having tact, diplomacy and pleasant manners.
Green - "I'm not racist but..."
Yellow - trying to pass off modern, daytime TV style claptrap as if it were your own little gem of enlightenment - "you can't expect anyone else to love you until you love yourself", "I'm just being myself" and on and on. Sitting there with a look on your face like you're expecting to be treated like your generation's answer to Confucius won't swing it either.
Red - laughing so loudly and incessantly - without a long enough gap to actually say anything funny in between - that your own (Freudian) id screams itself hoarse in desperation. These people are given to caring more that they are cool rather than clever, so I'm cheating.