Getting married may be one of the biggest decisions of your life, but if you come down with a case of pre-vow jitters, or cold feet, or your gut tells you to say "I don't," you should run -- according to a new study from the journal Science. Florida State University researchers had 135 couples married less than six months fill out a questionnaire about marital satisfaction. Although many of their conscious responses were optimistic, participants' "automatic attitude," or gut reaction, toward their partner weren't always as warm and fuzzy. Researchers gauged these gut instincts by flashing photos of the spouse followed by adjectives like "awesome," "terrific," or "awful." As it turned out, couples’ reported marital happiness tended to match their knee-jerk reactions. One conclusion from this study: Our gut feelings about our partner may be enough to warrant leaving them at the altar.