Socrates is a man.
Therefore Socrates is a rational animal.
Seems pretty straightforward, doesn't it? At least I thought so until I read this:
...the major premiss of this syllogism takes for granted precisely the point to be proved; for if Socrates is not rational (and no one questions that he is a man) it is not universally true that man is a rational animal.Looks like nothing is as simple as it seems.