You didn't talk to him much in high school, but here he is, buying you a drink and chatting you up like an old friend. After that second drink, he lets you know he has a great "business opportunity," which usually translates to a restaurant with a midget beer theme, or a guy who can make a bunch of iPad minis "fall off the back of a truck."

Here's a tip: If a business opportunity is that good, you don't need to tell strangers about it.