Good: You run into an ex. You're seeing someone new so you have leverage.
Bad: He's with a new girl, and she's prettier than you.
Ugly: She starts talking and it becomes obvious she doesn't speak a sentence's worth of English.
Good: You just made an awesome new friend.
Bad: They invite you to go with them to a rave.
Ugly: You laugh thinking they're joking and they're not.
Good: You get into work early. You're amped about getting business done.
Bad: Your boss is sitting at your desk.
Ugly: He has a boner.