When one of the crew asks the Production Assistant how many shots we have left

When the crew tell the producer that they're going to charge for overtime

When we have to wait for DIT after a shoot

When Lucy has to go to a meeting...up North

When a model shows up to a casting and she looks NOTHING like her spotlight profile pic

When you take the necessary precautions to back up all the rushes in case of accidental (/forceful) deletion

When you put yourself forward to be an extra in the ad. Usually accompanied by a feeling of instant regret.