The building is made of paper
The next user is eaten
i get hit by the bazooka, not its amo.................
the next user i a piece of paper being burned in a fire.
It turns out that I am a chunk of thorium dioxide that was mistaken for a piece of coal. Since thorium dioxide is not flammable, I am not harmed by the furnace, but I do contaminate the insides of it with radioactivity.
The next user is a piece of ice on the surface of Venus.
I'm a rocket, however.
The next user is a normal human inside a 2 meter deep pool (full of liquidified bird droppings) covered by a huge tungsten carbide sheet.
However, it turns out that the parasite could not survive in the presence of elemental oxygen. As a result, it died long before I could get infected by it.
The next user gets infected by a virus that attacks cardiac tissue. As a result, you die from your heart rupturing.