Worse than fishermen, many home-based investors can tell you about “the one that got away” – a little company that listed on the stock exchange for a few cents a share, only to become the next big thing a few months later. And then there's the reverse - the day-trader who wishes he or she had taken a time-out before committing to a block of worthless shares they bought "on a hunch". Imagine wearing a bracelet that warned you that you were positively or negatively stressed - either scared or greedy - and what you were about to do might not be entirely rational? Philips Electronics and Dutch Bank ABN AMRO have developed a concept device that does just that. The Rationalizer is an emotion sensing system designed to help serious online investors take a step back before plunging into their next transaction.