You think a Grizzly bear taking a swipe at your head is LESS dangerous than a chimp? I think this strategy worked is because once something is shoved down your throat, that’s what you concentrate on and I don’t think a chimp would be any different. The problem I see is that a chimps mouth isn’t as big as a bear or leopard’s so it would be tougher to do.
I think that once a human is physically close enough to a bear to fit a fist and forearm down its throat, the bear is not able to swipe at you with full force/full extension because you’re literally right in its face. It can certainly claw at you, and I’m sure it would, but you could attempt to bury your own face and head into its body to keep the claw damage on your back and sides (as the bear-wrassler evidently did, by biting the bear on the neck!).
A chimp, however, has hands with strong fingers and thumbs that can seek and destroy with pinching, pulling and rending motions that work just fine in a belly to belly situation. If you’re afraid of your extremities or soft parts like eyes, ears, testicles, etc., getting ripped off of you by an enraged chimp, shoving a hand into its mouth won’t prevent that at all.
A Grizzly could just roll on top and you’d be in trouble. They weigh 600 pounds.
So, you think a chimp could beat a Grizzly Bear?
I think it would do better than a human - if nothing else, fur provides some protection from bites and scratches.
But in the end, I think the bear does the arm-ripping off thing.
Pardon my ignorance of grizzly bear dentation, but if one were to shove one’s arm down the throat of a bear, wouldn’t it bite down hard? Might this not sever the arm, especially if accompanied by violent shaking on the bear’s part? It still might die from not being able to clear its windpipe but now you’ve got one less hand with which to apply your own tourniquet.
I think you are right - that only works if you are choking a Doberman.
Regards,
Shodan
ermm. Zombie Chimps don’t float. But I guess they don’t drown either and you can’t tread water forever.
I’m not saying I’d rather face a grizzly than a chimp, or that I’d bet on a chimp over a grizzly in a pit fight. Or that I think I now know how to defeat any given bear in a crisis situation by leaping in close and shoving my hand in its mouth (hell no!). I’m specifically addressing the dramatic tactic described as successfully used in unarmed human-vs-grizzly combat as being particularly less appealing when used against a chimp, because of what would probably happen: eye gouging, scalp tearing and probably some attempt at ripping off of soft body parts. Because chimps have hands, stronger forearms than us by a long shot, and a good sense of human anatomy from it being close to theirs.
I have no idea how that guy managed not to get shredded by bear claw while biting its neck with his mouth with his hand down its throat. I assume he came out of the encounter with severely lacerated arms and torso. Which I would argue is better than coming out of an encounter with your eyes gouged out and your private parts, ears, nose and scalp torn off.
Well, I think you are probably wrong. When an animal is choking, it thinks about coughing and flailing. At that point, I think a chimp’s nimble arms and hands would be far less dangerous than a bear’s massive arms and 4 inch long claws. Of course getting your fist there in the first place is probably harder on the chimp because, as I said, his mouth is smaller and he’s not trying to eat you like that friggin bear was.
No chance. Period. No chance.
Well, yeah. There’s no way an 80+ yr old lady is going to be able to take a crazy chimp, even if she’d been training since she was 5. That’s the boring answer!
eta: Oh wait! Submissive-fu! Curl-in-a-ball-fu!
Kickboxing or a similar art is your only chance. You don’t want to try to grapple with something that strong who is perfectly willing to bite you. A strong kick to the head could probably knock out a chimp. Probably your only chance.
Made me think of a Demetri Martin joke:
"I’m afraid of sharks, but only in a water situation. If I saw a shark on the street, I’d be like ‘What? F*ck you.’ It’s like the opposite of how I am with lions.” 
Wow, what an education about the ferocity of chimps. I had no idea.
I know the OP said no weapons, but my takeaway here (and to do a Koabayashi Maru scenario like Kirk did), is to change the rules/question and be armed with two holsters, one on each hip, plus a large knife for CQB. I figure if the chimp is on me, it’s over and I’m toast.
This is an old thred.
If we’re cheating, I’m bringing my 300-lb judo expert gun-toting employee to the fight, and 6 of his friends from the local gun range.
Will suggest he carry his combat shotgun…
Perhaps the best preparation for facing an enraged chimp would be a face mask and a steel jockstrap. 
Isn’t that just like a chimp…brings incisors to a gunfight.
Would drugs help? I mean, looking at the face-eating cannibal, he was stronger and didn’t respond to getting shot. So, with the right drugs (including steroids), could a human take down a chimp?
I can see it now: a reality show called “Face Off”, where every week a man on bath salts fights a homicidal chimp.
God has a funny sense of humor.