I have simply made a typo before when connecting someones electricity. So instead of putting it in for 05/05/2008 for example, i entered it as 05/05/2080.
Needless to say the customer didnt get connected and spent a weekend without power. He lodged a claim form with the company for losses incurred due to no power. EG: Claim for costs of hiring a hotel for his family, having to buy meals, and spoiled food. Would have cost the company a little bit