11. Be a truly selfless wingman or wingwoman
You know how when you play wingperson, in the back of your mind you're always thinking, "I'm so freaking charming right now, this chick/dude is loving it; if my friend screws this up is it a terrible thing if I let nature take its course?" Banish that thought. As the Dalai Lama said, "Our prime purpose in this life is to help others. And if you can't help them, at least don't hurt them.” And this is exactly the situation he was talking about!
12. Save a stranger from a creepy person's unwanted advances
You could try the standby tactic of pretending to be their boyfriend/girlfriend. Or you could pretend to be their husband/wife and say something like "Is this the person you've forsaken our beautiful baby for?" But maybe try the first one instead.
13. Stop a fight before it starts
There are many ways to diffuse tension, but experts agree the most reliable one is "Hey boys, how about I grab us all a beer and we talk this out?" Ideally one of the parties will say, "No, no, it's cool," and then the other party will say, "Yeah it's cool" and they'll separate to opposite sides of the bar and you won't have to actually talk to them.