Perhaps, the stress of baking caused you to unknowingly pick at the case.
Are the muffins nearly done... pick, pick, pick.
Is the bread burning... pick, pick, pick.
Did I add butter... pick, pick, pick.
Perhaps, the stress of baking caused you to unknowingly pick at the case.
Are the muffins nearly done... pick, pick, pick.
Is the bread burning... pick, pick, pick.
Did I add butter... pick, pick, pick.