I don't know where you are heading with this, so I'll just take it as a "curling in the squatting rack" type thread.
Ten years ago or so, I've met a guy at a comic convention I worked at.
We had some friendly bullshit dispute about, I don't know, comics, D&D, movies and their portrayal of combat, which got heated eventually - I think I argued that it was completely unrealistic that some midget could outfight a metal-clad fighter that outweighed him by a couple of hundred pounds.
If I recall correctly, there was some poster depicting an orc or giant(?) fighting a smallish dude, dwarf, halfling(?) whatever.
Bullshit geek discussion with every historic detail we could make up.
And then the guy tries to deliver the KO argument.
A sweet hostess we both knew came by so he said - literally:
"Look, I know what I'm talking about, I'm a Ninja. I train Ninjas."
My jaw dropped. I had sparred full contact before at this point, got through a no-bullshido phase and this guy looked like an unhealthy skinnyfat type of guy.
Turns out he DID do what he claimed. In theory, at least.
I knew of couple of guys who studied the kind of Ninjitsu he was refering about, which I would consider more of a ripoff. You know, supercostly seminars, hopping around in black ("night suit"-laughing myne arsch off!) uniforms, throwing "shuriken" at trees etc.
I talked a bit more with him over the next days and he was very open about it yet still full of bullshido.
I'll never forget how I extended our discussion about the clear weight advantage in weaponless fights. Since a convention is full of nerds, I just pointed on some smallish, clearly untrained visitor and asked him if he REALLY thought he'd enjoy no advantage over that midget, having more then a foot on him and weighing nearly double.
His answer: "Never understimate shorter guys. If I had to fight him, the first thing I'd do would be to drop on my back while simutanously kicking at both kneecaps."