Our definition of negligence basically means: you did something really stupid with our equipment. Meaning if you decide to attach our Canon 70-200 to the roof of your car with a suction cup and then drive on the freeway, the damage waiver doesn’t cover you when it falls off.
Please note, in all cases (except when renting gear clearly labeled for use underwater), we consider water or sand damage to be negligence. We also consider simple loss, and sensor damage from the sun, or lasers, negligence.