Don't mention Chuck Norris. It is unprofessional for this type of essay and looks adolescent.
Ha ha, do you mean to say there is never a time when Chuck Norris should be mentioned in an admissions essay? I think it is a good way to express the scariness of something. I know what starfire means, but I also think it is an interesting detail.
...like I was fighting a samurai warrior who didn't have a sword.---Ha ha, very good, but it might be even better to continue the Chuck Norris theme:
...like I was Chuck Norris fighting an unarmed opponent.
Ha ha, this is the part that is unprofessional. Maybe you should leave this part out: I jumped for joy and ran around the classroom shouting....l Instead of ending this way, end by reflecting on the significance of what you learned from that guy... the discovery you made that helped you get A's.It was like physics enlightenment. That is a cool theme.