while smashing a woman vigorously with your wombworm from behind, and begin to tingle like a paedo in madeline mccann, exclaim "baby im coming", "ooo yeah i wana cum on you baby", or even "wwwaaaaeeehhh on your arse love!". At this point, squirt, tip or pour depending on your general love-tap spray a portion of yoghurt on the small of her back, her arse or other point on the back of her body. She will then turn around, and at that point the suprise comes into effect, jam your chappie into her face and chafe away at the fella and spaff glorious amounts of man silk into her aghast face....shout "suprise!"

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.