Chronic Lateness
For clarity, "chronic" here means "three dates in a row." If your date arrives more than 10 minutes late each time, don't wait for his fourth arrival. No doubt your date will have wonderful excuses, and one or two may even be sound. But three in a row is a pattern, and what the pattern says is, "I don't want to get into this." So neither do you.
The result: Good ole' M who won't be on time at his own funeral.
Scary Divorce Stories
It's amazing how much a new prospect will tell you about his life on a first or second date -- much more than he knows he's saying. The question is: Do you hear it? If he launches into the story of his messy divorce, is his ex the villain in every respect? To me, that's a red flag right there. Anyone who's emotionally grounded should be able to see that two people, not one, contribute to a divorce.
The result: The one who didn't realize that I didn't want to smell, act, or think like his ex wife, who was haunted by the fact we both had the same car, and who, after I, finally fed up, yelled "I'm not ****!!" let out an exhasperated sigh, stared at me as if he were working on the bride of Frankenstein and said "I know"
Rudeness to Waiters
And taxi drivers, and anyone else in a service job.
The result: No result..yet. This one's obvious. As is the one about flings. Over that.