The movement that somebody with a side-fringe has to make to get the hair out of their eye. A side-fringe is a common characteristic of a so-called 'emo'.

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.

An emo twitch is the convulsion of a shaggy haired kid. When your emo bangs get in your eyes or are too far over for your bang-limitation, you swing your head to the side, causing the hair to flip over and get out of your eyes. The hair often will fall down again, causing another convulsion.
Injuries include cramped necks, an emo twitch OCD, or terrible music-listening to-ness*.
(*"Emo" music; It sucks penis.)