The Powder Toy

I teleport to another universe, while I send a clone back in time to the start of the game so that I win the game, causing a paradox that destroys this universe.   The next user is erased from e...

I am still a black hole from earlier, so I simply absorb the beam and send it to another universe.   The next user is in another universe, when Oats's death ray beam comes out of a white ho...

So basically a gas battery?

One second before death, I turn myself into a black hole, which stops time at its center due to its gravity.   The next user is vaporized when they collide with my inner event horizon.

I quickly destroy that by sending in a Reaper from Mass Effect.   The next user suddenly and painfully implodes into a singularity before becoming a new universe.

Fortunately, the machine completely stops, since the laws of physics do not allow perpetual motion machines.   I convert the next user into a block of enriched uranium via chemical separation an...

I bought 100 kilograms of pure unenriched uranium and thorium for my nuclear project.   Total: $710,864

I'm so happy! I've cut back to one cup a day!  

I have an ICBM Red Matter Explosive, so I simply create a black hole which Herobrine is then pulled into.   The next user was caught withing the blast range of the red matter, and are now trappe...

Fortunately, I no longer need happy pills.   The next user dropped the world's largest diamond down a storm drain. Not only that, but the museum that loaned it to you wants it back within o...