We've all been on terrible dates we have etched in our memory -- ones we wish we could undo with one snap of the fingers. When it comes to things that turn people off on dates, many people would agree that these rank pretty high on the list: 1. The person can't stop talking about themselves. They blather on about their car, job, or neighbor's cat, and you can't seem to get a word in edgewise no matter how hard you try. A person who's this self-absorbed and inconsiderate, needless to say, is not relationship material and should be weeded out. 2. They have bad manners. The first turn-off mentioned certainly falls into this camp. Beyond being a blabbermouth, the person might chew with their mouth open, look at their phone constantly, or flirt with the waiter/waitress. 3. They're argumentative. There's a fine line between putting your point across with conviction and trying to lock horns with your date just for the sake of proving you're right. 4...