The Ice Buck-her Challenge.

You can lead a horse to water, but you can't make him stand still while you pour a bucket of ice water on his back. That's not a popular saying for a reason, because most people would never think to do that. But, as we've seen time and time again, the Ice Bucket Challenge has inspired people to attempt all sorts of idiotic things in the name of charity. I'm not complaining. At this point, I'm no longer interested in seeing videos of people pouring water over their heads and saying, "Ooh, that's cold." Zzzzzz.

Sources: Uproxx