On pixiv, "I knew someone would do it" (誰か（が）やると思った) is a tag under which illustrations that fill people with anticipation and speculation. belong. When this tag is put on an illustration, it means some viewers are thankful because the artist has finally brought the illustration into existence whereas some other viewers, who might have thought of drawing the same thing, feel a wee bit resentful. It's a tag that invokes complicated feelings.
Today we have gathered some illustrations which have been put under the "I knew someone would do it" (誰か（が）やると思った) tag. Some illustrations depict AUs or a dream mash-up. Enjoy all of them!