Sydney Skyscraper is a daring act combining vertigo and defecation. One partner gets to an elavated position (at least 10 stories high), aims their ass over the edge while hanging precariously. They then drop their brown bomb onto the chest of their partner who is eagerly awaiting it on the ground below. Extra points are awarded for a direct facial hit. Variations include, the "Cherry Picker" (in lieu of a Skyscraper) and the "Hit and Run" (dropping your cable on an unsuspecting passerby and making a run before they can ID you...only for advanced afficianados).

The safeguarding of Earth and other worlds from biological cross-contamination (i.e. billionaires with too much time on their hands).

Also known as “planetary protection.” Planetary protection / quarantine “reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail.”

There are two types of interplanetary contamination. Forward contamination is the transfer of viable organisms from Earth to another celestial body. Back contamination is the transfer of extraterrestrial organisms, if such exist, back to the Earth's biosphere.