Nothing happens, since I don't believe gods exist.

I pour nitrogen triiodide on the next user, which explodes the instant it touches them.

The claimed to be heroin is actually citric acid powder. It tastes great.

The next user is sentenced to death with the lethal injection and an electric chair.

I escaped with my pink unicorn.

The next user is Internet Explorer about to get killed by Chrome and Mozilla.

However I put some malicious code in Chrome and Mozilla to get alive...

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OFFTOPIC: @Oats (View Post)

How didn't you get banned? I said 'You get banned'

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The below user is sent to another world. He is now unable to get back.

EDIT: That world is going to explode within 1 second.

However, since the planet has a very high mass, the nuclear explosion in its core only creates several earthquakes on the surface. I later find a wormhole leading back to our universe.

I fire a ten terawatt gamma ray laser at the next user. 

That gamma ray laser is just a plain laser beam which was only 1 watt.

The next person is eaten by a shark that has 4 rows of jackhammer teeth, which causes the next user's body to be dismembered permanently and dead.

The shark had no way of powering the Jackhammers and spontaneously imploded.

The next person gets swarmed by 90,000,000,000 zombies and has no weapons or tools to help them escape.

However those zombies are dead and could not move.

The next user is made of C-4 and somebody is smoking. The fire is going near him.