Mark Mathis

We've all seen weathermen at one time or another act flat out crazy or at least a bit eccentric. So how much of the craziness is real and how much is merely performance shtick to attract attention? The latest prominent example of on-air weather craziness comes to us courtesy of AccuWeather.Com's Jim Kosek. Here is a Business Insider report (including a strange shot at Bill O'Reilly) on Kosek's…