Results Of A Poor (or no) Preflight: Two test pilots on board, and no one checked the controls free and clear before starting t/o roll. It hurts to watch this video, but it's a dramatic reminder that there really are good reasons to do a thorough preflight and to make sure the controls are free.
This happened just north of Winnipeg, and the aircraft was the first version with PT-6-67 Turboprops. ('Modernized' Caribou.) The Canadian DOT concluded that the control locks were still locked when the aircraft took off. You who have flown the Caribou wonder how that could have happened when it is physically impossible to advance the throttles (past 1800 RPM) with the gust-lock in -- but this aircraft had been modified (still Restricted Category) and the throttle quadrant was not properly rigged to accommodate the throttle levers for the turbine engines.

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