Furniture

Look at a light piece of furniture and click it to pick it up. Sneak to put it down.

Attack while carrying it: it flies and hits every zombie in its path, 3 damage + 2 per weight point.

Every piece breaks after a number of hits; zombies that get stuck bash it too. A broken fridge gives 1 or 2 fresh foods, a broken cupboard dry food or a household item, a broken Shopping Crate snacks.

Block doors and corridors with heavy pieces. The Fort Builder achievement asks for 10 pieces.