Humpty Bump Turnaround: Flying straight and level pull / push 1/4 loop to verticle upline, perform 1/2 roll,
Pull / push 1/2 loop to verticle downline, pull / push 1/4 loop to straight and level in the opposite direction of entry.
Can be entered and exited from upright or inverted.

Options. Flying straight and Level pull / push 1/4 loop to verticle upline, perform 1/4 roll, pull /push to 1/2 loop
to verticle downline, perfom 1/4 roll, push /pull 1/4 loop to exit straight and level in opposite direction as entry.
This is a cross box option which allows the pilot to move the plane either closer to or farther from the flightline.

This is a narrative of a Pattern humpty bump, Imac and full scale may do it different in regards to roll placement.
The humpty bump can also be done in the center of the aerobatic box which you could omit the rolls or add another
half roll on the downline, or change the direction of the 1/4 rolls so you exit in the same direction as entry.
No matter how the maneuver is done it will look like and upside down U.