I was knocked out in a motorcycle accident, taking a blow to the based of the neck and back of head that would have killed me without a full helm.

Had weird moments when someone would mention something, and a flood of lost memory would come back in a rush.

The most significant was a friend of mine that thought I was mad at him. We worked together for 8 years and we went on a week long fishing trip for my 40th birthday.

Did not recognize him from Adam until he called me and asked me why I never called/emailed and was I mad at him for something.

Felt like getting hit again when all the memories came rushing back, triggered a massive migraine.

Anyway, be prepared for weird shtuff like that.