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All newlyweds should express some level of affection—but too much of any good thing can be a problem too. According to an oft-cited 2001 study published in the journal Interpersonal Relationships and Group Processes, couples who displayed overly intense amounts of affection at the onset of the marriage were more likely to get divorced in the long-run compared to couples who were less overtly affectionate. A fire that strong takes a lot of effort to keep alive—so naturally, it will burn out faster than one that starts as a manageable spark.

Before you tie the knot, make sure you figure out finances, living arrangements, future career paths—anything that could potentially get in the way of your happiness and relationship down the line. If you fail to do so, your relationship might be doomed from the start. In a 2001 survey of more than 2,000 married and divorced people in Oklahoma, researchers found that "little or no helpful premarital preparation" was a top reason cited by divorcees for why their marriages didn't last.

Want to show what a major villain you are in a movie? Hold up the hero by his or her throat, preferably over a cliff. While this happens at the climax of many a fight scene in action movies, in real life, unless you have superhuman strength and your victim has a steel neck, it's almost impossible to do without something dislocating along the way.

Can't open a safe in a movie? If you have a stethoscope—or even just an empty glass pressed against the safe—you'll crack it in no time. In fact, this has been thoroughly debunked as an effective method of picking a lock. As it turns out, all the numbers' clicks sound pretty much the same—if you can hear them at all, that is.