"On June 30, 2024, a Tianlong-3 first stage detached from its stand during a static fire test due to a structural failure, resulting in an unintentional liftoff."

Resolves YES if any space-capable non-ICBM rocket lifts off from the pad (or other infrastructure) under the power of its own engines for at least one whole second when it was not intended to (the vehicle must remain off the ground for ≥1s and at least one engine must remain operational for ≥1s).

Resolves NO if this hasn't happened by EOY 2034 (UTC)

Examples of situations that would count:

Lifting off during a static fire such as in the Tianlong-3 incident

Lift off during a launch countdown but distinctly prior to T-0 (for simplicity let's say at least ten seconds prior)

A reusable rocket lifting back up after touching down (so long as it remains off the ground and with an engine operating for ≥1s, and the 'bounce' was unintentional)

An air-launched rocket like Virgin Orbit detaching from its plane under the thrust of its engines while the plane's in flight but ≥10s before intended ignition

Examples of situations that wouldn't count:

An explosion on the pad that throws the vehicle upwards

An accidental lift off that rips the vehicle apart in <1s

An accidental lift off where the command to shut down all engines occurs and successfully completes in <1s

An air-launched rocket igniting while attached to its plane but not detaching from the plane

An accidental ICBM launch

An accidental launch of a rocket not capable of reaching 100km

I won't bet in case resolution is ambiguous

Feel free to ask for clarification on anything