a Fergasun
A Fergasun is when someone posts something so idiotic it makes your eyes roll into the back of your head, and then he runs like he’s been hit by a truck.
A thread that says, "I believe the sky is green, and the clouds are angry." Then the poster vanishes.
A person starts a thread about why the moon is a secret society, then leaves forever.
A post that says, "The internet is fake, and I’m the only one who knows." Then he gets hit by a truck.