PuG Rules: A Random Selection
PuG Rule #5987
In a low level instance, everyone who has a level 80 main will find some way to let the entire group know. Most will strive to be at least somewhat natural about it (example: "Let's chain pull. I have an Ulduar raid in 40 minutes.") but, inevitably, someone will lack that kind of verbal finesse (example: "My main is 80, haha!" "How many 80's do u got?" "U should give me lead cuz my main is 80 and that makes me better than u nubs, lul.").
PuG Rule #3249
The player who is crying the loudest about a wipe is probably responsible for it.
PuG Rule #7410
The rogue will die. Always.
PuG Rule #7411
Said rogue (see Rule #7410) will inevitably blame the healers — even if they happened to precede the rogue in death because he was tail-swiped into whelps that the paladin off-tank couldn't be troubled to pick up. ("Run to me!" the failadin exclaimed, conveniently forgetting that he has run-speed on his boots and an AoE taunt. Clearly, protection DPS > protecting the healers.)
* * *
This is just a random selection. There are many, many more.