An employee was using a stand-up forklift to place a pallet on the second tier of a racking system. The boxes on the pallet hit the third-tier shelf and started to fall. The employee lowered the pallet and struck the second-tier shelf, which caused the pallet to tip. The employee quickly moved the lift back and lowered the pallet. The employee then stepped off the back of the lift, which moved, pinning him against the racking behind him. He suffered a broken leg.