This isn't the first time the internet has gone wild looking for secret clues from Swift. The singer reportedly hides hidden clues in the lyrics of her songs, which can be determined by looking at certain letters from the album booklet. (Personally, I've stared at this for a long time and truly don't know how people figure any of these phrases out.) So, comparatively, the "13" Easter egg is actually pretty straightforward. Still, Swifties are a dedicated bunch — we're surprised this observation didn't go viral before now.