The extraterrestrial is performed by deliberately (in some cases, nondeliberately) taking a shit on a toilet seat. This may be performed either as an act of revenge or a practical joke.
That asshole definitely stole my Kindergarden Cop dvd so I'm totally gonna perform the extraterrestrial in his bathroom.
Extraterrestrialism is an ideology that supports that extraterrestrials are friends of humans and that humans should prepare themselves for be integrated to the other extraterrestrial species. Extraterrestrialism also supports massive research for extraterrestrials and the evolution into an extraterrestrial civilization as well, despite extraterrestrialism also supports that humans are also extraterrestrials and aliens somehow. Extraterrestrialism also believes that all extraterrestrial lifeforms are equal and that they should cooperate between each other.
"Extraterrestrialism is well known by support the integration of humanity into other extraterrestrial species and even the support that humans are extraterrestrials somehow."