[keanebean86]

For months when the LHC came online there were articles about it creating a black hole that would gobble the earth. I'm waiting for a larger accelerator to get built so everyone will claim it could lower the vacuum ground state and destroy the universe.

[manicdee]

A cascading bubble of quantum vacuum propagating outwards at the speed of light!

I don't see the need to worry about such things, since we'll never know that they happened.

[klyrs]

My personal favorite is negatively charged strangelets... probably never caught on because black holes are a familiar concept.

https://en.m.wikipedia.org/wiki/Strangelet#Dangers