If you've ever been on maintenance duty or your job involves working on old objects, you'll know the terror of when something chips, cracks, a bit falls off.... Fortunately people are usually very understanding, but it still doesn't stop your heart racing when you have to confess.
(Incedentally, I was stood a good fifteen minutes or so poking that slither of wood together with one finger, while everyone who walked past asked "What's wrong?" and I had to explain over and over "I spilt the wood with an electric drill" their mocking comments or looks of outright pity were penance enough for the accident.