Then today's your lucky day. Mythbusters did a bit on exactly this, i.e. if you're holding a hammer and about to fall into water, whether throwing it ahead of

Then today's your lucky day. Mythbusters did a bit on exactly this, i.e. if you're holding a hammer and about to fall into water, whether throwing it ahead of you will break the surface tension and save your life: https://www.youtube.com/watch?v=oCSQExxWulU https://www.youtube.com/watch?v=oCSQExxWulU