An anomaly is something that does not confirm to established and proven theories of science. People through and through are basically all the same until you meet one who seems like an anomaly. Seriously, they seem to defy every theory you might have and just as you begin to think that after all you have found you much sort after anomaly, they just have to go and prove you right(that there are no anomalies. They are all the same, one way or another.)
Disclaimer:I don't claim to be different. As a matter of fact, i more or less am the pig all men are made out to be.