April Fool's

Applied to OMMC Announces RIP by Ryan Greenblatt ago
Applied to Death with Awesomeness by osmarks ago

AnApril Fool's Day is an annual event inevery year on April 1, and is celebrated by practical jokes or humorous content (such as the US, which couldposts under this tag). The event can be thought of as "Notice Your Surprise" day. 

See also