I love my hammer. Get in there and smash away! It's a good idea to put them in a cardboard box and then break your pieces. Do this when no one else is around because the sound of breaking pottery is a little unnerving. Don't let anyone grab stuff out of the garbage. Smash em small enough so that they are completely unusable.
I think I shall go out to the studio with my hammer right! now!
p.s. It's always a good idea to cull your work before it goes through the glaze fire. That crack on the bottom / rim,or wherever is not going to get smaller.Don't waste energy on it.