You,like most people,probably have been in such a situation where yo are being asked for a business card, and while reaching for it...and...oops.. "I'm sorry, I must be out at the moment" or "they must be in my other bag" or "I left them at the office, I'm sorry," and the conversation continues on with some sort of story about how this "never happens to me " or "I knew I was forgetting something this morning..."