It was a rasin cookie, and I don't like those, so I gave it to someone else.

 

The next user is that someone else.

I don't like raisin cookies either. I choose to throw it away, and it is lost from the world.

 

The next user falls into the sun.

...and instantly teleport out as discussed in http://what-if.xkcd.com/115/.

 

I be really nice and let the next user get off free.

I thank you and give you a moo cookie as I leave.

 

The next user is going to get slapped by a sack of moldy potatoes.

I get food poisoning, but am fine in the long term.

 

The next user discovers they have a fatal, incurable disease.

(make an Ebola joke and I will kill you myself)

It's not Ebola, so there's a decent chance I survive.

 

The next user is targeted by a drop bear.

"fatal"

"incurable"

 

whatever

@airstrike52 (View Post)

 Dropbears don't actually exist, so nothing happens.

 

The next user is a normal human who is teleported into the core of a neutron star. The heat and pressure there is so extreme that you are instantly imploded into a blob of neutron matter.

I am inside an impenetrable suit.

The next user doesn't exist.

i am a nonexistent thing. no change.

the next user is bored to the point he must suicide.