This pilot did. A long time ago :-) What is a "barrel roll"? A barrel roll occurs when an object (usually an airplane or roller coaster) makes a complete rotation on its longitudinal axis while following a helical path, approximately maintaining its original direction. The G load is kept positive (but not constant) on the aircraft throughout the maneuver, commonly not more than 2-3 G, and no less than 0.5 G. In aviation, the maneuver includes a constant variation of attitude in all three axes, and at the midpoint (top) of the roll, the aircraft is flying inverted, with the nose pointing at a 90-degree angle ("sideways") to the general path of flight. The term "barrel roll" is frequently used, incorrectly, to refer to any roll by an airplane (see aileron roll), or to a helical roll in which the nose remains pointed generally along the flight path. In fact, the barrel roll is a specific and difficult maneuver; a combination of a roll and a loop. It is not used in aerobatic competition. To read more: http://en.wikipedia.org/wiki/Barrel_roll