Du's Law state that whenever a product or service goes mainstream, it's quality usually diminishes.
"If it goes mainstream, it goes to shit"

The act of extreme masturbation. You must "knock one out" whilst in close proximity to any of the following; Your mum, a nun, your boss, a member of parliament, George Michael. A person with capabilities to act upon catching you mid self-abuse obvisouly ups the ante. Ejaculation must be reached before your danger wank target comes (no pun intended) to investigate. The higher the chances of being discovered with one's pants down, pulling one's war face is obviously where the danger comes from. The more danger involved the harder (or softer) it is to complete the task in hand (snigger). The more dangerous the better. The chance of being arrested, pummeled by an angry father or having your hand severed by an arab's sabre means that you are a pro "Danger wanker."

Du's Law is similar to Godwins Law in some respects. Du's Law is an assertion that has become an Internet adage. It states: "As an online discussion grows longer, so does the probability of a reference to Wikipedia. In other words, Du said that, given enough time, in any online discussion—regardless of topic or scope—someone inevitably makes reference to Wikipedia. The calling of Du's Law immediately ends the argument.