a Fergasun
A Fergasun is when someone starts a thread that’s so dumb it could make your brain explode, and then he leaves like he’s escaping a fire.
A thread that says, "I think the sun is a conspiracy, and I’m the only one who knows." Then the poster disappears.
A post that says, "I believe the internet is a lie, and I’m the only one who saw it." Then he runs away.
A person starts a thread about why shoes are the most important thing in life, then leaves forever.