Meme: "Yes", and "We don't"Yes We Don't.
Originator: Squeamish Ossifrage, and yyyyyyy.
Background: In this question asking how can we be certain that current cryptosystems won't get broken all of a sudden, yyyyyyy answered in two words: "We don't" - a painful fact which everyone must acknowledge, and something must be accepted without thinking - elegantly summarized in just 2 words.
Then later, a meta question asking literally: "Is a two word answer to a complex question really acceptable", Squeamish Ossifrage answered in tribute to yyyyyyy "Yes" - elegant in every way, and controversial as it received many up votes not because people agree with it (although some might), but because of its satirical value.