The Powder Toy

However, the nanobots do not have a critical mass, so there is no nuclear explosion.   The next user is turned into a cube made of uranium-238.

Strange matter (Star Trek calls it "red matter.")

Fortunately, I am an atom of Tc-99m, so I just emit a gamma ray, becoming Tc-99.   The next user is hit by my gamma ray, causing a fatal, incurable case of brain cancer.

However, I happen to live in Soviet Russia, which means that it's human season, as opposed to deer season.   The next user eats a candy bar - with a sewing needle inside it.

@nmd (View Post)  Your links are broken.

I put the fire out - by opening the airlock allowing all of the air in the room to escape into space, before closing it and refilling the room with air.   The next user is swept out into space...

@TPTROXRLYITSTRUE (View Post)  5/10   @Aloysius1234 (View Post)  0/10 - Really?   BBNG - Big Bang. Placing a pixel of this creates a new universe.

Plutonium-239 (Fissile isotope used in most modern nukes.)

On Phobos, which allows me to throw the rock into space, since Phobos has very weak gravity.   The next user is teleported to Jupiter's moon Io where they die of radiation poisoning.

One of my clones was Demoman200, but the infinite amounts of black magic used caused the entire universe to rip itself apart, destroying everything within.   The next user is being painfully shr...