I'd second what Bryan* said there. Endo Shihan is amazing in the way he "plays" with people.
Other than that Sensei Jorma Lyle from Sweden constently amazes me with what he can make happen, doing almost unreal things, like making you fall over before getting within a couple of feet of him. Very different to the "norm".
*BTW - Hi Bryan - we appear to live in the same town, sunny Milton Keynes! Hope to see you on the mat sometime - we can swop impressions of Endo Sense!