" The failure to remember is not a lie, although liars will often try to excuse their lies, once discovered, by claiming a memory failure. It is not uncommon to forget actions that one regrets, but if the forgetting truly has occurred, we should not consider that a lie. for there was no choice involved. Often it will not be possible to determine whether a memory failure has occurred or whether its invocation is itself a lie. "

― Paul Ekman , Telling Lies: Clues to Deceit in the Marketplace, Politics, and Marriage