I was just simply shifting from first to second as I was rapidly accelerating, as I normally do, but for some reason got a vicious tank slap from a tiny front wheel hop almost causing me to lose it. I've never had this happen to me before. Apparantly I blew the left fork seal in the ordeal. Is blowing the fork seals a common occurance during a tank slap? I'm not looking forward to replacing it...I know they can be a pain in the arse.