I first saw this done as a plebe in a military school, where my parents thought that attendance there would straighten me out. It might have helped some but that's another subject. Fortunately I was never one of the flushees receiving the procedure noted below. And because we all were given short haircuts upon arrival at said academy, the desired results were only partial, although the effects seemed to be long-lasting.
1. Identify obnoxious, irritating, and totally off-base loudmouth who could use some shutting up.
2. Gather a crowd around such person, pretending to desire an exposition of said person's wisdom, so he won't suspect your motives.
3. Upon hearing something outrageous, grasp limbs of such person and head for the john.
4. Insert person head-down in the toilet.
5. Flush.
6. Withdraw person.
7. Note resulting hairdo and immediate attitude adjustment.