I know a guy who once thought he should fill his tire to the maximum instead of lowering them. He flies to Europe from America for bike touring. He claims he had both tires blown off the rims once. In the right circumstances with the right wheels and tires 5 or 10 psi extra could be enough to get the tires off the rims. What if the tire gauge is off and he really filled them over the maximum to start with, for example?