(Here's a lucid we had last night where we did something that would have killed us IRL, but had no effect on us in the dream).
Being Challenged By This Guy To Shoot Our Self In The Face During A Dream - Shooting Our Self In The Face (DILD)
Being somewhere with these people where this guy is explaining to us that since we're dreaming we can't be hurt, which guy asks us to prove to ourselves that we can't be hurt by shooting our self in the face with this gun.
Becoming lucid and realizing that we can't be hurt since we're dreaming, so shooting our self in the face with the gun, after which we feel nothing except for this puff of air coming toward our face when we fire the gun. Feeling elated knowing that we can't be hurt in our dreams.