The bomb detonates, spreading photos of Russian tzars everywhere, but otherwise leaving everything unharmed. (You said Tzar BOMB, not Tzar BOMBA)

The next user is in the exact same situation, only that the bomb was replaced with the Tzar Bomba and its timer set to 3 seconds instead.

The bomb has a sticker that says Made in China, which means crappy quality. The rest is self explanatory.

I stab the next user in the head. Normal human, not immortal. No nearby hospitals, no other people. No first aid stuff. Not a dream.

You stab me with a spoon. It hurt, but it didn't kill me.

The next gets a nokia phone dropped on their head from space.

I get sent to hospital with severe headache.

The next one is dying of old age. Not immortal, not a dream.

My brain is taken an placed inside a robot.

The next user's spinal cord ceases to exist.

It is the future, and advanced biotechnology exists. I simply get another one.

The next user [REDACTED]

I [REDACTED] my way out, then [REDACTED] the [REDACTED]. Simple.

The next user is in the core of a neutron star. You are naked, a normal human, wearning normal clothes in the normal present.