The real Aikido anti-grappling!
I figured that title would get some attention. Here is a video of Koichi Tohei, mixing it up with a judoka.
For those unfamiliar with Tohei, he studied judo before becoming a student of Morihei Ueshiba, the founder of Aikido. He was the first disciple of Ueshiba to teach Aikido outside of Japan, and was chief instructor at the Hombu dojo before he split from the main organization 1974 to start his own splinter style -- "Ki Aikido." As such Tohei may be held responsible for the "no touch" style of Aikido practiced by such as Jukka Lampila.
Maybe the match is not 100% genuine, but in general I thought this was about the best example I've seen of an Aikidoka resisting a grappler. What do you all think? Does this look at least like a halfway honest effort to take Tohei down? Bear in mind that, as the narrator point out, Tohei did not use any of his more deadly techniques.