People expect others like them, people don't. Same concept as not everyone likes oranges. However, expectation is something unpredictable, during exams or relationships. Incidents like a person whom u take as an enemy is actually a friend, vice versa, those are pretty good examples. Not to mention if that particular person is double-faced. I always predict the result after exams, and very often, it does not turn out as what I've expected. Luck plays quite an important role in expectation though. If you're in luck, things might turn out better than expectation or the other way round.