Just to make sure that I don't discriminate in my prejudice, here's a complete list of dogma espoused by door knockers:

Regards John

Taoism: Shit happens.
Confucianism: Confucius say: "Shit happens".
Buddhism: If shit happens, it's not really shit.
Islam: If shit happens, it's the will of Allah.
Judaism: Why does this shit always happen to us?
Hinduism: This shit happened in my last life too.
Protestantism: Shit happens cause you don't work hard enough.
Catholicism: Shit happens because you are bad.
Zen: What is the sound of one shit happening?
Moonies: Only happy shit happens.
Christian Science: Shit is in your mind.
Agnosticism: Maybe shit happens, maybe it doesn't.
Jehova's Witnesses: Let us in and we'll tell you why shit happens.
Rastafarianism: Let's smoke this shit.
Hare Krishna: Shit Happens, Shit Happens, Shit Shit Happens Happens, Shit Happens, Rama Rama.
Atheism: No shit.