Nice. That was pretty funny especially when he says "Hey how's it goin' Phil" after he states Ninja's have a tendancy to cling to ceilings that was hilarious. Also when he says "Ninja's do not respond well to insults" was completely hilarious nice work man. The quality of animation was nicely presented and had some good styles do it, as well as some very nice voice acting making this sound completely normal and neccessary. That was hilarious when it was showing how to catch a ninja blade with your bare hands, the timing was great.
At times the comedy was a little vague and you would want to skip a step or two in the video to get on to the next one, so the option to do that should be aloud. The introduction wasn't all that great it just kind of started showing Ninja tactics.
A funny video man keep up the excellently done work, very funny stuff although not much of a replay effect as it's more dry humor and it's quite simple actually.