Well, one thing to note is, how would you expect something that is unexpected when you think that it cannot happen but you only found out that it can happen after you found it out.
For example: Someone who is lazy and not very bright finishes an exams, he did not study for it whatsoever. Then on they day he gets his results, he would expect bad results, but his teacher tells him to "Expect the Unexpected", but he thinks this is not possible until he gets his results which is quite good. How would you expect that.
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