I was wearing a fireproof jacket.
The next user accidentally swallows a blob of red matter, causing a black hole to open up inside their stomach.
I'm in space
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GLADoS floods the next users home with a deadly neurotoxin
I have a portal gun, so I open a portal to the moon which sucks in all of the toxins, as well as GLADoS.
THe next user was also pulled into the portal, and is now stuck on the moon.
Then i start talking about birds.
The next person is going to stuck in two portals, going down down faster and faster. Also the portal is a giant one. The portal gun is in the north pole in ice.
I was water.
The next user is halfway through a portal, and then the portal shuts off.