Lol, this is a crazy discussion.
A chimpanzee coming at someone with the intent to hurt them would be unstoppable without a weapon, and it better be a fast efficient weapon like a gun or a tazer.
Full grown male chimps are not the cute little smiley faced primates like Bubbles that Micheal Jackson's maid was watching him bang. They look like lean gorillas.
A 135lb female chimp did a one armed pull of something like 1287lbs, and probably didn't understand that they wanted her to try as hard as she possibly could. The strongest men on the planet don't have the grip strength to pull that kind of weight while holding it with both hands and pulling in a lift that is designed to get maximum strength out of our body. And that's a small female's strength.
People often forget the set of fangs a Chimp has and their bitting strength.
And if you've ever seen video of chimps fighting in the wild, or going after the Baboons that they hunt and tear to pieces with their bare hands to eat, then you know there wouldn't be a slow "feeling out" process to the situation. They are blazing fast, and grabbing hold of one and trying to do something with it would probably have a similiar feeling of trying to grab and wrestle with a 4-wheeler atv while someone sits on it and plays with the throttle. Meanwhile, your bones are snapping everywhere and 2 inch k9s are stabbing your repeatadly over and over.
Baboons have been known to defeat leapords in a fight, and watching a Chimp go after one of them is like watching my pitbull go after his favorite stuffed animal.
In a fight between a chimp or a bear, choose the bear. At least you can play dead and have a chance of the bear leaving you alone. When male chimps think they have another dead, they really do tear the nuts off, and since we are shaped in a similiar way.... that tells you what playing dead would likely result in with a chimp.