An act of blasting a hot, silent fart while exiting from a crowded elevator. Ideally, the gas should be leaked just before you exit through the closing elevator door. The remaining riders are trapped in the chamber to enjoy the fully marinated scent.
Variation: The Echo Chamber. Performing a Chamber of Secrets, but substitute a silent secretion with a loud, shreeking fart as you emerge from the elevator.
After eating a foot-long meatball sub from Subway, I performed a chamber of secrets in the hotelelevator, shouting "Jared" as I exited.
Bill, Jim, Tod, and Alyx waited, hiding behind a corner as brave Chad stealthily made in his way into the Chamber of Secrets to see what exactly made it such a welcoming place to share gossip, stories, rumors, and the like between the female species. When he got in there all he found was 4 stalls, 2 mirrors, 2 sinks, and a garbage can and was greatly flabbergasted as to how this place could be like an overcrowded grocery store given the right moment of time during the day.
The act of dumping 100 proof or higher alcohol into one's anus, which is put in position above one's head (doing a headstand is the most accepted way to do this) and thenlighting the alcohol on fire.