OK i use a time-machine to go back in the past.

The next user is in WWII(World War 2) where he stands on the beach where D-Day happens.

By a water gun.

 

The next user has battery acid poured down throat.

That will go good with the lead I ate for breakfast.

 

THe next user is an atom of antihydrogen in a particle accelerator about to collide with a hydrogen atom.

@Michael238 (View Post)
The particle accelerator was slightly off aim and i miss the hydrogen particle.

The next swam in a river infected with brain-eating amoebae. The amoebae get into the user's brain and eat it fully within milliseconds.

My body distorts into CHON particle. After the accelerator stops, Aloyminium (Ay) is formed.

 

 

The next user can't keep calm and carry on

With a knife made of paper. The knife breaks.

The next user suicides by putting a metal knife in himself/herself.

I try to stab myself with the knife, but the metal shatters, since it was gallium.

 

The next user is in the same situation, but the knife was made of titanium plated steel.