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I made a cardboard tube sword (with dowel and foam core) to crush my nephew in our swordfights
(lemmy.world)
Dowel running the length of it right down through the handle. Used string to compress the foam. Fed it into the tube and unwound so the foam expanded to wedge it in there so the tube can be replaced.
Next time I babysit I'm going to dominate the swordfighting... Once he admits defeat he can keep the sword
Obligatory:
"To crush your enemies, see them driven before you, and to hear the lamentation of their women." - Conan the Barbarian
Or perhaps:
"Crush your enemies! Grind their bones into dirt! Make them regret they were ever born!" - Abraham H. Parnassus
depending on whether you have a pesky H. R. Pickens in your life, or not.