Also the use of "period" as an interjection, which according to the list was invented in 2010 and has not been in use in some form since the 3rd century BCE.
Laughter and death as a combined concept has been present since Ancient Greece, where it is held that Zeuxis died from laughing at a portrait of an ugly woman he was painting. Ded stems from a folk etymology for dead reckoning. Emerged on the internet in the early 1990s as a representation for regional speech.