Rarity is the fashion focused unicorn from My Little Pony Friendship is Magic, which premiered in 2010, voiced by Tabitha St Germain. Her polite, theatrical way of speaking made short lines easy to clip for reaction use online. This grateful phrase circulated on soundboards as a standalone thank you button, separate from full episode scenes. Fans and editors reuse it because the meaning is clear without context, the delivery is instantly recognisable to viewers of the show, and the short length fits chats, streams and meme edits.