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Since you clearly have something in mind, once you reveal it, are we going to go "Oh, yeah, that's much more sensible than the gliders that are dropped near the boundary of glide vs. stall air pressure," or are we going to go "well, that's arbitrary."
Rigid hot-air-balloon shapes that start out at 1500 Celsius and fall to earth once they are no longer keeping the air under them hot. Seed crystals in a hailstorm. Any object that falls faster if broken and will break if dropped from the higher altitude. Solid-state electrostatic thrusters pointed downward, that arc and fail if the pressure is too high. Spinning propeller craft thrusting downward that undergo a laminar to turbulent transition if the pressure is too high.
As Lumifer said, "freefall" and as the initial conditions say - rigid bodies.