Very nice.
I love the style of this animation. I think what makes it successful is not necessarily the element of surprise... it's the casual attitude the guy has the whole while, and how he is so calm and collected about the ordeal.
If you want to run with this series, I say go for that; place him in rather chaotic or normally highly emotional situations (where one would not keep a cool head), and have him just go about his business of kicking butt and taking names as if it's an everyday ordeal.
For example, I remember the Warner Brothers and Hanna Barbara cartoons back in the day, when they'd have the little duckling/puppy/baby/etc. in a busy construction yard, or a dangerous highway scene... and they would act like everything was perfectly normal.
That, in my opinion, as how to approach this, if you were to make it a series. Nice job.