Toothless is the Night Fury dragon from DreamWorks' How to Train Your Dragon, first released in 2010, where he is Hiccup's loyal companion. Clips and fan edits of the dragon dancing turned that usually serious character into a reaction meme online, especially on TikTok and YouTube. The dancing version spread because it is instantly readable without context: a cute dragon celebrating to a catchy loop. It remains popular for edits, remixes and comment-style videos whenever a moment calls for carefree, slightly smug happiness rather than a dramatic reaction.