ever fight 10th dan of ninjtsu/jj?

I was looking for some laughs so I surfed some websites on ninjutsu/jujutsu. It seems like all the insturctors I saw were a 10th dan in ninjutsu and an 8th dan in japanese jujitsu.

Anyone ever fight one of these guys? It would be kind of funny to see them loose. They look so confident and all.

They would fight you, but they'd have to kill you.

that would be way too dangerous...