Breaking a snowboard in two would be tough. You could break an ankle trying to stomp on it hard enough so that the snowboard breaks. Of course, this would probably be much less of a problem for many posters on this forum, who could go to town with their SAK or multi-tool saw and cut that thing just about in half.

If you could manage that, then you should be able to use at least one of the bindings to hold one of your feet to it. Maybe, you could use both. Not sure, it's been a few years since I used a snowboard.

I doubt most posters on this forum would seek to do this though.