The same thing happened when George Dillman failed to knock out a National Geographic representative with a “Chi” knockout. Dillman's explanation went like this:
“The skeptic was a totally non-believer. Plus – I don't know if I should say that on film – but if the guy had his tongue in the wrong position in the mouth, that can also nullify it [chi power]. You can nullify it – you can nullify a lot of things. In fact, you can nullify it if you raise those two big toes! If I say I'm going to knock you out, and you raise one toe, and push one toe down....I can't knock you out. And then, if I go to try again, you reverse it. If you keep doing this, I won't knock you out.” Wikipedia
http://en.wikipedia.org/wiki/George_Dillman
Dillmen and all the other shysters are fucking lame!